Find the value of x and y?

17x-y+12x+4y+90=180

And

4x+y+6x-y+130=180

Its about tringles c: thanks and explain!

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  • 8 years ago
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    First of all let's simplfy:

    17x - y + 12x + 4y + 90 = 180

    29x + 3y + 90 = 180

    4x + y + 6x - y + 130 = 180

    10x + 130 = 180

    Since x is isolated in equation 2, we solve for x:

    10x + 130 = 180

    10x = 50

    x = 5

    Now we substitute x in the first equation to determine y:

    29 * 5 + 3y + 90 = 180

    145 + 3y + 90 = 180

    235 + 3y = 180

    3y = -55

    y = -18.33

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