Question

How do you solve 9x - 7 = -7 and the question on the picture

Answer 1

9x - 7 = -7
+7. +7
9x=0
9x/9=0/9
X=0
5)r=20

Answer 2

x = 0

r = 20

Explanation:

9x - 7 = -7

add 7 to each side of the equation:

9x = 0

x = 0

-4 = (r/20) - 5

add 5 to each side of the equation:

1 = r/20

multiply both sides by 20:

r = 20