SOLUTION: Write the equation in polar coordinates. Then isolate the variable r when possible. x2 + y2 = 8x

Question 1080053: Write the equation in polar coordinates. Then isolate the variable r when possible.
x2 + y2 = 8x
Found 2 solutions by ikleyn, rapture:
Answer by ikleyn(52780) (Show Source): You can put this solution on YOUR website!
.

x = , y = . ====> = = . Therefore, your equation in polar coordinates is = . Next, you can cancel "r" in both sides. Then you get your FINAL equation = .

Solved.

Answer by rapture(86) (Show Source): You can put this solution on YOUR website!
Let x^2 + y^2 = r^2

Let x = rcosθ

x^2 + y^2 = 8x

r^2 = 8rcosθ

Divide both sides by r. This will isolate r.

(r^2)/r = (8rcosθ)/r

r = 8cosθ

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