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16 July, 05:21

Solve the system of equations. - 4x+7y = 20 & y=3x+15

solve for x and y using substitution

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  1. 16 July, 09:07
    0
    Substitute y = 3x + 15 to the equation - 4x + 7y = 20:

    -4x + 7 (3x + 15) = 20 use distributive property

    -4x + (7) (3x) + (7) (15) = 20

    -4x + 21x + 105 = 20 subtract 105 from both sides

    17x = - 85 divide both sides by 17

    x = - 5

    Substitute the value of x to the equation y = 3x + 15:

    y = 3 (-5) + 15

    y = - 15 + 15

    y = 0

    Answer: x = - 5 and y = 0
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