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17 March, 01:11

Solve the following system of equations.

- 2x+7y=9

3x - 4y=-20

+2
Answers (1)
  1. 17 March, 01:18
    0
    y = - 1

    x = - 8

    Step-by-step explanation:

    -2x+7y=9 / * 3

    3x - 4y=-20 / * 2

    -6x+21y = 27

    6x - 8y = - 40

    -6x + 6x + 21y - 8y = 27 - 40

    13y = - 13

    y = - 1

    -2x + 7 * (-1) = 9

    -2x - 7 = 9

    -2x = 9+7

    -2x = 16

    -x = 8

    x = - 8
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