Asked by Lynette
Solve the system equations
y=4x+8,x^2+7x-20
I'm truly lost
y=4x+8,x^2+7x-20
I'm truly lost
Answers
Answered by
Steve
I assume your two equations are
y = 4x+8
y = x^2+7x-20
So, just set them equal:
x^2+7x-20 = 4x+8
x^2+3x-28 = 0
(x+7)(x-4) = 0
x = -7 or 4
See
http://www.wolframalpha.com/input/?i=x%5E2%2B7x-20+%3D+4x%2B8
y = 4x+8
y = x^2+7x-20
So, just set them equal:
x^2+7x-20 = 4x+8
x^2+3x-28 = 0
(x+7)(x-4) = 0
x = -7 or 4
See
http://www.wolframalpha.com/input/?i=x%5E2%2B7x-20+%3D+4x%2B8
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