If the point P(-3/5,y) lies on the unit circle and P is in the third quadrant, what does y equal? If necessary, use the slash mark ( / ) for a fraction bar.

Question

ranga · Answer

The equation for unit circle is x^2 + y^2 = 1
The point P has x = -3/5.
Plug in x = -3/5 and solve for y.
Remember that P lies in the third quadrant which means both x and y values on the circle will be negative.
So your y answer must be negative.

goformit100 · Answer

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anonymous · Answer

So -4/5

ranga · Answer

Yes!