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21 February, 05:25

George and Bella are asked to solve - 3x - 30 = 5x + 18. Identify where one of them made an error.

George

Bella

- 3x - 30 = 5x + 18

- 3x - 30 - 5x = 5x + 18 - 5x

-8x - 30 = 18

- 8x - 30 + 30 = 18 + 30

-8x = 48

Negative 8x over negative 8 equals 48 over negative 8

x = - 6

- 3x - 30 = 5x + 18

-3x - 30 - 3x = 5x + 18 - 3x

- 30 = 2x + 18

-30 - 18 = 2x + 18 - 18

- 48 = 2x

Negative 48 over 2 equals 2x over 2

x=-24

+4
Answers (1)
  1. 21 February, 09:06
    0
    For the second,

    In the first step, instead of adding 3x for both sides, they subtract 3x instead.
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