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9 July, 02:10

Solve this system of linear equations. separate the x-and y-values with a comma.

-2x=8-6y

-15x=21-6y

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  1. 9 July, 02:16
    0
    (x, y) = - (1,1)

    Step-by-step explanation:

    -2x=8-6y (divide by - 2)

    => x=-4+3y

    -15x=21-6y (divide by - 3 for simplicity)

    =>5x=-7+2y

    We know that x=-4+3y, insert this into expression "5x=-7+2y"

    5 (-4+3y) = -7+2y

    -20+15y=-7+2y

    15y-2y=20-7

    13y=13

    y=1

    Since x=-4+3y we can find x by using y=-1

    x=-4+3 (1)

    x=-1
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