SOLUTION: hello, i'm really confused how to start off this equation; i've been told that i have to put it into the general formula ax^2 + bx + = 0 (is that even correct also?) here is the si

Algebra ->  Systems-of-equations -> SOLUTION: hello, i'm really confused how to start off this equation; i've been told that i have to put it into the general formula ax^2 + bx + = 0 (is that even correct also?) here is the si      Log On


   



Question 805611: hello, i'm really confused how to start off this equation; i've been told that i have to put it into the general formula ax^2 + bx + = 0 (is that even correct also?) here is the simultaneous equation: (Solve for x and y)
y=+2x+%2B+5
x%5E2+%2B+y%5E2+%2B+6x+-+2y+%2B+2+=+0
p.s. i hope i've written the question clearly enough, since it's my first time on this site
thank you in advance :)

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
y=+2x+%2B+5
x%5E2+%2B+y%5E2+%2B+6x+-+2y+%2B+2+=+0
substitute 2x+5 for y
x%5E2+%2B+%282x%2B5%29%5E2+%2B+6x+-+2%2A%282x%2B5%29+%2B+2+=+0
(x+1)*(5 x+17) = 0
x = -17/5, y = -9/5
x = -1, y = 3