Question

Which of these shows the result of using the first equation to substitute for y in the second equation, then combining like terms?

y = 2z
2x + 3y = 16

A. 5x = 16
B. 4x = 16
C. 5y = 16
D. 8x = 16

Answer 1

D. 8x=16

Explanation:

If y=2x, then

2x+3y=16

2x+3(2x) =16

2x +6x=16

8x=16