Algebra 1

Solve.
y=2x - 7
3x - 4y=8

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  1. Eq1: Y = 2X - 7.
    Eq2: 3X - 4Y = 8.

    In Eq2, substitute 2X - 7 for Y:
    3X - 4(2X - 7) = 8,
    3X - 8X +28 = 8,
    -5X = 8 - 28 = -20,
    X = 4.

    In Eq1, substitute 4 for X:
    Y = 2*4 - 7 = 1.

    Solution Set = (X,Y) = (4,1).

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