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andre [41]
3 years ago
8

If the point P(-4/5,y) lies on the unit circle and P is in the third quadrant, what does y equal? If necessary, use the slash ma

rk ( / ) for a fraction bar.
Mathematics
2 answers:
aleksandr82 [10.1K]3 years ago
8 0
We use the fact that x2+y2=1  This is the equation of the unit circle.
We know that x=-4/5, so plug this in and solve for y
x2+y2=1 <span>(−4/5)^2+y2=1</span> 16/25+y2=1 y2=1−16/25 y2=9/25 <span>y=−square root of 9/ 25</span>
y = -3/5
guapka [62]3 years ago
7 0

Answer:

-3/5

Step-by-step explanation:


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