## Algebra: A Combined Approach (4th Edition)

x+y=-1 (use the second equation solve for y ) y=-1-x Replace y with -1-x in the first equation, and then solve for x $x^{2}-2(-1-x)=5$ $x^{2}+2+2x=5$ $x^{2}+2x-3=0$ $(x-1)(x+3)=0$ x=1 or x=-3