# Find the Cartesian equation for .

r = 4sec(θ)

x2 + y2 = r2
y = rsin(θ)
x = rcos(θ)

## The Attempt at a Solution

Given that r = 4sec(θ), I replaced sec(θ) with 1/cos(θ) and got x = 4. The problem is that I'm not sure if that's the final answer because I have been unable to find r, y or θ.

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jedishrfu
Mentor
Is that the whole problem statement? We can't help if we don't see the complete statement.

Did they expect you plot it or convert it to xy coordinates?

If it's a conversion to xy then whatif you place the secant on the other with the r?

Dick
Homework Helper

r = 4sec(θ)

x2 + y2 = r2
y = rsin(θ)
x = rcos(θ)

## The Attempt at a Solution

Given that r = 4sec(θ), I replaced sec(θ) with 1/cos(θ) and got x = 4. The problem is that I'm not sure if that's the final answer because I have been unable to find r, y or θ.
The cartesian form of r = 4sec(θ) IS x=4. It's a vertical line y can be anything. Why do you think you should be able to find r, y or θ?