Mathematics College

y = - 2x + 1
2x - 2y = 4
Solve systems of equations by substitutions

Answers

Answer 1

Answer:

x= 1

y= -1

Step-by-step explanation:

y=-2x+1

2x-2y=4

substitute for y

2x-2(-2x+1)=4

reduce

2x+4x-2=4

6x=6

x=1

y= -2(1)+1

y= -1

Related Questions

Can someone help me with this please

Answers

Answer:

9,17

Step-by-step explanation:

larger no=8+smaller no

larger no+ smaller no= 26

::8+s(larger no from equation 1 )+s=26

*2s=18

*s=9

Evaluate using the given values.​
a=1 b=2 c=3 x= -3 y= -2 z= -1
1.)2a+b/2 -c/b
2.)4x+3y
3.)5ab
4.)7y+2b
5.)7+a
6.)2b/4y
7.)3c-5z^2
8.)xyz
9.)ab/y^2
10.)6/abc

Answers

Answers:

1)1 1/2

2)-18

3)10

4)-10

5)8

6)-1/2

7) 34

8)-6

9)-1/2

10) 1

HELP guys i need extra to pass in my school and i am still failing by three points please i cant get it up on my own Madison has $6.50. Potatoes are $0.50 per pound. How many pounds of potatoes can Madison afford to buy?

In two or more complete sentences write and solve an inequality for this situation. Explain how you would solve this inequality.

Answers

Answer:

0.5p < 6.50

p < 13

Step-by-step explanation:

The inequality would be p < 13. Since Madison can't spend more than 6.50, the cost of potatoes would need to be less than 6.50. To solve the inequality, you would have to divide both sides by 0.5, giving you p < 13.

Answer:

Madison can buy 13 pounds of patatoes.

Step-by-step explanation:

You have to divide 6.50 by 0.50, but in order to do that you have to move the decimal on both sides two times to the right then you can divide. Then to double check you muliply 13 by 50.

Which of the following can you use to find 20 percent of 48

1. 002(48)
2. 02(48)
3. 2(48)
4. 20(48)

Answers

Answer:

It's number 2

Step-by-step explanation:

20% of 48 is 9.6

If you help I will give you brainliest

Answers

9514 1404 393

Answer:

  5 miles

Step-by-step explanation:

Time/speed/distance problems can be worked a number of ways. Here, we want to know the distance walked. We know the total time and the total distance and the two different speeds. So, we can use a variable to represent the value we want to know: w = distance walked (in miles).

The total time is 9:00 -6:50 = 2:10 = 2 1/6 hours = 13/6 hours.

The total time is the sum of times for the two parts of the trip: walking and riding.

  walking time = walking distance/walking speed

  = w/3

  riding time = riding distance/riding speed

  = (20-w)/30

The total time is that given above:

  w/3 +(20-w)/30 = 13/6

  10w +(20 -w) = 65 . . . . . . . . multiply by 30

  9w = 45 . . . . . . . . . . . . subtract 20, collect terms

  w = 5 . . . . . . . . . . . divide by 9

The girl walked 5 miles.

Write an inequality that matches the graph.

A number line from zero to ten is shown. A ray extends to the left from a closed circle at six.

Answers

Answer:

[tex]x \leq 6[/tex]

Step-by-step explanation:

because the ray travels left, x has to be lower than 6, and since it is a closed circle, means that 6 is included in the answer, so x is less than or equal to 6.

Stella is writing an essay. She writes 2 pages in 16 minutes. The number of pages represented by p and time is represented by t. [2 points]



Part A) Fill in the table below.

Pages (p) Time (t)
2 16
(a) 32
5 (b)

Answers

Answer:

I think the answer is 32

Step-by-step explanation:

if you multiply 16×2 it will equal 32

An equation is shown below:

8(2x − 14) + 13 = 4x − 27

Part A: Write the steps you will use to solve the equation, and explain each step. (6 points)

Part B: What value of x makes the equation true? (4 points)

Explain the parts please and i will give brainliest the best best explained one.

Answers

Answer:

x = 6

Step-by-step explanation:

8(2x − 14) + 13 = 4x − 27

solve everything in parentheses

16x - 112 + 13 = 4x - 27

subtract 4x from each side of the equation

16x - 4x - 112 + 13 = 4x - 27 - 4x

reduce

12x - 112 + 13 = -27

combine those known numbers

12x - 99 = -27

add 99 tooth sides of the equation

12x - 99 + 99 = -27 + 99

reduce

12x = 72

divide both sides by 12

12x / 12 = 72 / 12

reduce

x = 6

I need help with this problem

Answers

You know you can use Photomath or cythmath ??
If that radius =4
Then diameter=8

So the square will be 32
Because 8*4(side of square)=32


I’m not sure :)

what is 3/4 as a fraction out of 100, a decimal,and a percentage​

Answers

Fraction: 75/100
Decimal 0.75
Percentage: 75%

D
А
A
10
ол |
3
сл| -
alw

Answers

Answer:

1/5 is the answer eeeeeeeeeeeeee

B. 1/5
I’m pretty positive that’s the answer

A medical clinic asks all of its patients to complete a quick survey after each appointment. Patients are asked to rate their experience on a scale of 1 to 10, with 1 representing a very poor experience, and 10 representing an excellent experience. The surveys are separated into categories based on age. Then, each month, a random sample of 10 surveys are gathered from each age category. The results of this month's random samples of the 40-60 age group and the 60+ age group are shown below.

40 - 60 2 6 5 5 3 7 3 9 1 4
60+ 4 8 7 10 3 6 5 8 9 5
The mean rating of the 40-60 group is two points _____
than the mean rating of the 60+ group. This difference is about ______
the variability of either group.

Answers

Answer:

A. Lower

B. Half

Step-by-step explanation:

Answer:

1. Lower and 2. Half

HELP ASSAP I need help on this question​

Answers

Answer:

X= 1, 2, 3, 4, 5

Y= 10, 20, 30, 40, 50

Step-by-step explanation:

hope this helps please press the pink "thanks" button

(4a^5-a)+(a^5+6a-1)
Add

Answers

Answer:

Step-by-step explanation:

4a^5 - a + a^5 + 6a - 1

5a^5 + 5a - 1

A snail moves 3/8 of a foot in 1/5of an hour. What is the snail's speed in feet per hour?
A) 3/40 feet per hour
B) 1 5/8 feet per hour
C) 1 7/8 feet per hour
D) 2 7 /8 feet per hour

Answers

b because you don’t multiply the denominator, so you mulitply the top by 5, to get 15 and put it over 8. so 15/8

Answer:

B) 1 5/8 feet per hour is your answer

3/8foot=1/5hour

15foot =8hour

1 foot =8/15 hour

Solve the following inequality for w 8w+8>-10w-5

Answers

Answer:

Step-by-step explanation:

8w+8 > -10w-5

18w + 8 > -5

18w > -13

w > -13/18

The volume of this cylinder is 1751 cubic units. What is the volume of a cone that has the same base area and the sam height

Answers

Answer:

[tex]V_2 = 583.67[/tex]

Step-by-step explanation:

Given

Represent the volume of the cylinder with V1 and the cone with V2.

So:

[tex]V_1 = 1751[/tex]

Required

Find V2

The volume of a cylinder is:

[tex]V_1 = \pi r^2h[/tex]

Because the cone and the cylinder have the same base area and height, the volume of the cone is:

[tex]V_2 = \frac{1}{3}\pi r^2h[/tex]

Substitute [tex]V_1[/tex] for [tex]\pi r^2h[/tex].

[tex]V_2 = \frac{1}{3}\pi r^2h[/tex]

[tex]V_2 = \frac{1}{3}V_1[/tex]

Substitute 1751 for V1

[tex]V_2 = \frac{1}{3} * 1751[/tex]

[tex]V_2 = \frac{1* 1751}{3}[/tex]

[tex]V_2 = \frac{1751}{3}[/tex]

[tex]V_2 = 583.67[/tex]

The volume of the cone is 583.67 cubic units


5th grade math. Correct answer will be marked brainliest.

Answers

start with 1 ones, 8 tens, and 6 hundredths

Which graph is the solution to the following inequality

Answers

Step-by-step explanation:

-8x+5 > 21

Minus 5 from both sides

-8x > 16

Then divide 8 from both sides (also I am pretty sure the sign would change because you are dividing by a negative number)

x < -2

So the answer is x is less than or equal to -2

or C

I hope this helps!

Please help w my math homework giving a 100 points

Answers

Answer:

It is only 5 point not 100,she cappin

Step-by-step explanation:

Plz guys help me plz

Answers

It’s hard to see! Please let me know the numbers on the graph

Find the number of solutions of the equation 9h^2 - 12h + 4 = 0 by using the discriminant.​

Answers

Answer:

Step-by-step explanation:

H=2/3

Answer:

one real solution

Step-by-step explanation:

:)

Help its pre-algebra haha help plz

Answers

Answer:

8 ramen bowls

4 pho bowls

Step-by-step explanation:

12-4=8

1/3 divided by 3 1/2

Answers

Answer:

2/21

Step-by-step explanation:

Given that f(x) = 2x - 5, find the value of x that makes f(x) = 15.
а
5
b
10
20
Od
25

Answers

B) 10
if you plug in 10 for x it will make you multiply 2 time 10 which gives you 20 then subtract 5 which gives you 15

Answer:

When x=10 f(x) is equal to 15

Step-by-step explanation:

Just substitute the two equations, 15=2x-5 -> 20=2x -> x=10.

7. The school librarian orders 35 new
books each year. How many new
books did the librarian order in the
past 12 years?

Answers

Answer:

420

Step-by-step explanation:

35x12

. What is the change of temperature if it was -20 degrees and rose to 14 degrees?​

Answers

Answer:

34

Step-by-step explanation:

please mark brainly :)

Listen in equation what is 596×9 subtract 64÷5 is this hard 13 points

Answers

Answer:

5351.2

Step-by-step explanation:

596 times 9 = 5364

64 divided by 5 = 12.8

5364 minus 12.8 = 5351.2

First part: 5364
Second part: 12.8
5364 - 12.8 = 5351.2

You have 18 pencils.

Seven pencils fit in a pencil case.

How many cases do you need to hold all of your pencils?

Answers

Answer:

you need three pencil cases to hold all of your pencil

Answer:

3

Step-by-step explanation:

18 = 7 +7 + 4

Since each box can carry 7 pencils, we need three to hold all of them.

Hope this helps!!

Write an equation of the line that passes through the given points. (−3, 5), (0, −1)

Answers

Answer:

Step-by-step explanation:

(-1 - 5)/(0 + 3)= -6/3 = -2

y - 5 = -2(x + 3)

y - 5 = -2x - 6

y = -2x - 1

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