Question

What values from the set {10, 11, 12, 13} that makes the equation 2(× - 5) = 12 true is, , 10, 11, 12 or 13?

Answer 1

Answer: The value necessary from the set to make the equation true was 11.

Explanation:

Process of elimination:

1. 2([10]-5)

= 2(5)

= 10, not 12.

2. 2([11]-5)

= 2(6)

= 12; the answer we need.

We substituted x for 11, and then the equation worked; so therefore the value we needed from the set was 11.