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11 October, 12:49

3) 5x+4y=-30

3x - 9y=-18

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  1. 11 October, 13:19
    0
    Step-by-step explanation:

    5x+4y=-30 ... (1)

    3x - 9y=-18 ... (2)

    divid (2) by : 3

    x - 3y = - 6 so x = 3y - 6 ... (*)

    put this value for x in (1) : 5 (3y - 6) + 4y = - 30

    15y - 30 + 4y = - 30

    19y = 0 so : y = 0 put this value in (*) : x = 3 (0) - 6 ... x = - 6
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