Take the 2-minute tour ×
Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

I need help finding $P(x, y)$ from this information: the point $P$ is on the unit circle, obviously. The $y-coordinate$ of $P$ is $\frac{-1}{9}$ and the $x-coordinate$ is positive. I need help finding $P(x, y)$

share|improve this question
3  
Well, the formula for a unit circle is $x^2+y^2=1$, so just plug in $y$ and solve for $x$. –  Joel Cornett Oct 21 '12 at 4:33

1 Answer 1

up vote 8 down vote accepted

Any point on the unit circle is $x^2 + y^2 = 1$. You are given $y = - \dfrac19$ and $x>0$. Can you find $x$?

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.