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21 October, 08:52

Solve linear equation by elimination

5x+2y = - 3

3x+3y = 9

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Answers (1)
  1. 21 October, 09:57
    0
    Multiply equation 1 by 3 and equation 2 by 5

    15x+6y=-9

    15x+15y=45

    15x+6y - (15x+15y) = -9-45

    15x+6y-15x-15y=-54

    -9y=-54

    y=-54/-9

    y=6

    Substitute y=6 in equation 2

    15x+15 (6) = 45

    15x+90=45

    15x=45-90

    15x=-45

    X=-45/15

    x = - 3

    Therefore, x = - 3, y=6
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