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9 February, 20:54

A student solved the problem below but made an

error.

- 3x = 12

+3 + 3

x = 15

+3
Answers (2)
  1. 9 February, 21:11
    0
    Division should be used instead of multiplication

    -3x=12

    x=-4 (divide by - 3)
  2. 9 February, 21:15
    0
    Because - 3x is one term, you need to divide both sides by - 3, not add 3 to both sides:

    -3x = 12

    Divide both sides by - 3:

    -3x/3 = 12/-3

    x = - 4
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