I need help

Question

Solving the system of equations algebraically and Showing all the steps involved.
y=x^2+2x
y=3x+20

Answer 1

since both say y =

we equate:
x^2+2x=3x+20
x^2 - x - 20 = 0
(x-5)(x+4)=0
x=5 or x=-4

for x=5, y = 35
for x=-4, y = 8