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Nikolay [14]
3 years ago
14

Help Solve for x. 1. -3x + 4 = 31

Mathematics
2 answers:
Tcecarenko [31]3 years ago
5 0
<h2>Hello!</h2>

The answers are:

1  x=-9

2  x=16

3  r=-2

<h2>Why?</h2>

To know the solution of the problems, we need to isolate each variable.

Remember that:

- If we have an equality: if the number is adding (positive sign), and if you need to move it to the other side of the equality, its sign changes to negative.

- If we have an equality: if the number is subtracting (negative sign), and if you need to move it to the other side of the equality, its sign changes to positive.

- If we have  an equality:  if the number is part of a product , and if you need to move it to the other side of the equality, the same number will be dividing the factors of the side.

So:

1 - Solving for x

-3x+4=31\\-3x=31-4\\-3x=27\\x=\frac{27}{-3}=-9

2 - Solving for x

2x-10=22\\2x=22+10\\2x=32\\x=\frac{32}{2}=16

3 - Solving for r

40=32-4r\\4r=32-40\\4r=-8\\r=\frac{-8}{4}=-2

Have a nice day!

quester [9]3 years ago
4 0

Answer:

1)-9

2)16

3)-2

Step-by-step explanation:

1)

-3x + 4 = 31

-3x = 31 - 4

-3x = 27

-x = 27/3

-x = 9

x = -9

2)

2x + -10 = 22

2x = 22 + 10

2x = 32

x = 32/2

x = 16

3)

40 = 32 – 4r

-4r = 40 - 32

-4r = 8

-r = 8/4

-r = 2

r = -2

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