Homework Help: calculus

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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