Solve the following system of equations and show all work. y = x2 4 y = 2x 1 [Solved]

y = -x^2 4
y = 2x 1

Subtract the bottom equation from the top .
Hence
0 = -x^2 2x 3
x^2 2x 3 = 0
Factor
( x 3)(x 1) = 0
x = -3