SOLUTION: Solve for x and y simulteneously: y - x = -1 Y - 7 = x^2 + 2x

Algebra ->  Systems-of-equations -> SOLUTION: Solve for x and y simulteneously: y - x = -1 Y - 7 = x^2 + 2x       Log On


   

Question 1070403: Solve for x and y simulteneously:
y - x = -1
Y - 7 = x^2 + 2x
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
y=x-1
-
-
%28x-1%29-7=x%5E2%2B2x
x-8=x%5E2%2B2x
x%5E2%2Bx%2B8=0


x=%28-1%2B-+sqrt%281-4%2A8%29%29%2F2

x=%28-1%2B-+sqrt%28-31%29%29%2F2

x=%28-1%2B-+i%2Asqrt%2831%29%29%2F2-----find corresponding y for each.