Question

15-a=20 what value would make this true

Answer 1

-5

Explanation:

15-(-5)=20

5 turns into a positive

15+5=20

Answer 2

a = -5

Explanation:

15 - a = 20

Move the constant of 15 to the other side by subtracting it.

-a = 5

Divide by -1 to make a positive.

a = -5

Check.

15 - (-5) = 20

15 + 5 = 20

20 = 20