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24 February, 19:01

How would you solve - 7x+y=-19 and - 2x+3y=-19 with elimination or substitution

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Answers (2)
  1. 24 February, 19:13
    0
    -7x + 1y = - 19 ⇒ 14x - 2y = 38

    -2x + 3y = - 19 ⇒ 14x - 21y = 133

    19y = - 95

    19 19

    y = - 5

    -7x + (-5) = - 19

    -7x - 5 = - 19

    + 5 + 5

    7x = - 14

    7 7

    x = - 2

    (x, y) = (-2, - 5)
  2. 24 February, 19:30
    0
    You could solve it with elimination by multiplying the whole first equation by - 3 and then once you do that you can cancel out the 3's.
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