Posted by **Nicole** on Tuesday, January 20, 2009 at 5:28pm.

x^2 + y^2 = 25

3x + y = 15

Find the two points of intersection.

I don't just want the answer, if you could tell me how to find it, it would save my life. The sqaure root is making it really hard for me to understand.

- calculus -
**bobpursley**, Tuesday, January 20, 2009 at 6:24pm
from the second,y=15-3x

then square it...

225-90x+9x^2 check that, and put it in for y^2 in the first equation, rearrange it in quadratic form, and solve for x using the quadratic formula.

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