Question

Find an equivalent equation to -3x-5=16 by adding five to each side. *

-3x = 21
-3x = 11
-3x = 16
-3x - 10 = 21
-3x - 10 = 11
-3x - 10 = 16
-3x + 10 = 21
-3x + 10 = 11
-3x + 10 = 16

Answer 1

- 3x = 21

Explanation:

- 3x - 5 = 16

- 3x - 5 + 5 = 16 + 5

- 3x = 21

- 3x ÷ - 3 = 21 ÷ - 3

x = - 7

Answer 2

-3x = 21
Explanation: on the -3x-5 side, add 5 to -5. That cancels it out so you are left with -3x. On the 16 side, add 5. 16+5 is 21. Therefore, -3x = 21 is equivalent to -3x-5 = 16.

Also:
If you are also supposed to solve the equation the answer is x = -7.