Solve the system of equations:

y = 2x+1

y = x2 + 2x-8

x = ±3

Step-by-step explanation:

Put both equations equal to each other.

2x + 1 = x^2 - 8

Cancel 2x on both sides.

1 = x^2 - 8

Add 8 to both sides.

1 + 8 = x^2

Simplify 1 + 8 to 9.

9 = x^2

Take the square root of both sides.

±√9 = x

±3=x

Simplify.

x = ±3