Question

In the equation 2r - 7 = 15, what value of r makes this equation true?

Answer 1

r = 11 makes 2r - 7 = 15 true.

Explanation:

2r - 7 = 15

Add 7 to both sides.

2r = 22

Divide by 2.

r = 11

Proof:

2r - 7 = 15

2(11) - 7 = 15

22 - 7 = 15

15 = 15