This is the question:
4x + 3y = 24, x^2 + y^2 = 25
Find where the line intersects the circle.
I tried solving for y, the substituting it into the circle equation, but I don't get the correct answer. It ends up becomes a messy quadratic equation.
Can someone help me out? Thanks.
Actually I do know why, but I want to see every step that lead you to this. (And when you start typing those steps you will probably find the mistake yourself, which is another reason why I asked you to show all your work).
BY the way: http://www.wolframalpha.com/input/?i...B+y%5E2+%3D+25
I squared to get , which is a^2.
For 2ab, I did
Hmm, looks like I squared it wrong before. I think I also expanded it using the wrong equation, since (-4/3 + 8)^2 is equivallent to (8 - 4/3)^2, which expands using the (a - b)^2 equation.
I think I've got the correct answers now.