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31 March, 16:42

Use the substitution to solve the system of equations

y = - 2x

x-3y=21

+2
Answers (2)
  1. 31 March, 18:31
    0
    Pretty sure the answer is (3, - 2x)
  2. 31 March, 18:48
    0
    y = - 2x

    x-3y=21

    x - 3 (-2x) = 21

    x + 6x = 21

    7x = 21

    x = 21/7

    x = 3

    y = - 2x

    y = - 2*3

    y = - 6

    (3, - 6)
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