Question

Tony solves the linear equation 3(x - 3) + 2x + 9 = 2x + 2(x - 1) using the step shown below.

Step 1: 3x - 3 + 2x + 9 = 2x + 2x - 1
Step 2: 5x + 6 = 4x - 1
Step 3: 5x - 4x = -1 - 6
Step 4: x = -7
a. He incorrectly combined like terms.
b He incorrectly applied the addition and subtraction properties of equality.
c He incorrectly applied the multiplication and division properties of equality.
d He distributed incorrectly.

Answer 1

D.)

Explanation:

because when you have numbers inside the parentheses, you have to multiply both of those numbers by the number to the right of the parentheses, not just the X.