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16 April, 18:51

Solve this system of linear equations. Separate the x - and y - values with a comma. 8x + 2y = -42 4x + 7y=-3

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  1. 16 April, 18:56
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    The value of x is equal to - 6. The value of y is equal to 3.

    8x + 2y = - 42

    4x + 7y = - 3

    In the first equation, subtract 8x from both sides.

    2y = - 42 - 8x

    Divide all terms by 2.

    y = - 21 - 4x

    Now that we have a value of y, we can plug it into the second equation to solve for x.

    4x + 7 (-21 - 4x) = - 3

    Distributive property.

    4x - 147 - 28x = - 3

    Combine like terms.

    -24x - 147 = - 3

    Add 147 to both sides.

    -24x = 144

    Divide both sides by - 24.

    x = - 6

    Now that we have a true value for x, we can plug it into either equation to solve for y.

    8 (-6) + 2y = - 42

    -48 + 2y = - 42

    Add 48 to both sides.

    2y = 6

    Divide both sides by 2.

    y = 3
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