If the point P(-3/5,y) lies on the unit circle and P is in the second quadrant, what does y equal?
1 Answer
Sep 26, 2015
Use the equation for the unit circle to solve for y.
Explanation:
The unit circle has a radius equal to 1 and is centered at the point (0,0). Therefore, the equation for the unit circle is:
Now use the coordinates of point P and substitute into the above equation:
Next, solve for y:
Finally, we know from the problem that P lies in the second quadrant. In the second quadrant, X is negative and Y is positive. Therefore, the final answer is:
Hope that helps!