Question

Need help showing work for this problem.Use the substitution method to find all solutions of the systems equations?
x^2+y=9
y=2x

Answer 1

well replace y in the quadratic equation with 2x

so you get

\[x^2 + 2x =9\]

well now to solve for x you have 2 choices

1. Complete the square

2. General quadratic formula

for mine, I'd complete the square in x
then solve for x

hope this helps