Question

The variable r represents a value in the set (4,6,7,8). Which value of r makes 2(r-4) + 3=7 a true statement?

Answer 1

r = 6

Explanation:

2(r-4) + 3=7 becomes 2(r-4) + 3=7 if we subtract 3 from both sides:

2(r-4) = 4

Then r - 4 = 2, and r is 6.