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9 June, 11:04

Substitution

-2x-y=-9

5x-2y=18

+1
Answers (1)
  1. 9 June, 11:14
    0
    - 2x - y = - 9 | + 9

    - 2x + 9 - y = 0 | + y

    9 - 2x = y

    5x-2y=18

    5x - 2 * (9-2x) = 18

    5x - 2*9 - 2 * (-2x) = 18

    5x - 18 + 4x = 18 | + 18

    9x = 18+18=36

    x=36:9

    x=4

    y = 9 - 2*4

    y=9 - 8

    y = 1
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