y=x^2-x
y=2x+18
What is the answer? SHOW YOUR WORK.
Plz help
what is the question? If you want a solution, then just do a simple substitution and you have
x^2-x = 2x+18
x^2 - 3x - 18 = 0
now, which two factors of 18 differ by 3?
post your work if you get stuck.
x^2 - x = 2 x +18
x^2 - 3 x - 18 = 0
(x-6)(x+3) = 0
x = 6 or x= -3
if
x = 6
y = 30
if
x = -3
y = 12
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check
x = 6
y = 2 x+18 = 12 +18 = 30, ok
x = -3
y = 12 ok