Question

If x = y – 9, and y – 4 = 10, x = ? A. -5 B. +5 C. 1 D. A and B

Answer 1

B

Explanation:

x = y - 9 → (1)

y - 4 = 10 ( add 4 to both sides )

y = 14

substitute y = 14 into (1)

x = 14 - 9 = 5