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22 September, 13:11

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 distributed incorrectly.

b

He incorrectly applied the multiplication and division properties of equality.

c

He incorrectly applied the addition and subtraction properties of equality.

d

He incorrectly combined like terms.

+2
Answers (2)
  1. 22 September, 13:36
    0
    (a)

    Step-by-step explanation:

    (a) He distributed incorrectly. Note that 3 (x - 3) = 3x - 9.
  2. 22 September, 13:37
    0
    a

    He distributed incorrectly.

    Step-by-step explanation:

    3 (x - 3) + 2x + 9 = 2x + 2 (x - 1)

    3x - 9 + 2x + 9 = 2x + 2x - 2

    5x = 4x - 2

    x = - 2
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