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Solve the system of equations algebraically. Show all of your steps.

y=x^2+2x
y=3x+20

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  1. y=x^2+2x
    y=3x+20
    well that means that
    x^2+2x = 3x+20
    or
    x^2 - x - 20 = 0
    (x-5)(x+4) = 0
    x = 5 or x = -4
    if x = 5, y= 3x+20 = 35
    if x = -4, y = 3x+20 = 8

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