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
Note: Enter your answer and show all the steps that you use to solve this problem in the space provided.
Solve the system of equations algebraically. Show all of your steps.
y=x^2+2x
y=3x+20
1 answer