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28 March, 18:43

Solve the system by substitution. 2x+y=-11 3x-4y=11

(3,5)

(-5,-3)

(-3,-5)

(5,3)

+5
Answers (1)
  1. 28 March, 19:23
    0
    2x + y = - 11

    y = - 2x - 11

    3x - 4y = 11

    3x - 4 (-2x - 11) = 11

    3x + 8x + 44 = 11

    11x = 11 - 44

    11x = - 33

    x = - 33/11

    x = - 3

    y = - 2x - 11

    y = - 2 (-3) - 11

    y = 6 - 11

    y = - 5

    solution is (-3,-5) <==
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