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14 May, 06:59

Solve 15x+3y=9,10x+7y=-4

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  1. 14 May, 07:28
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    x = 1, y = - 2

    Step-by-step explanation:

    15x + 3y = 9 (1)

    10x + 7y = - 4 (2)

    3 * (2) - 2 * (1)

    3 * (2)

    30x + 21y = - 12 (3)

    2 * (1)

    30x + 6y = 18 (4)

    (3) - (4)

    15y = - 30

    y = - 30 / 15

    y = - 2

    sub y = - 2 into (1)

    15x + 3y = 9

    15x + (3 * - 2) = 9

    15x - 6 = 9

    15x = 9 + 6

    15x = 15

    x = 15 / 15

    x = 1
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