Question

Find the value of 9y - 9 giving that -4y - 1 = 7.

Simplify your answer as much as possible.

9y - 9 = ?

Answer 1

-4y - 1 = 7
add 1 to both sides
-4y = 8
divide both sides by -4
y = -2

plug in y = -2 into 9y - 9
9(-2) - 9
-18 - 9 = -27

answer: -27

Answer 2

9y - 9 = - 27

Explanation:

Given

-4y - 1 = 7 ( add 1 to both sides )

4y = 8 ( divide both sides by -4 )

y = -2

Then

9y - 9 = 9(-2) - 9 =- 18 - 9 = - 27