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

Question

andre [41]

4 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] · Answer 1 · 2021-12-17T12:49:49+03:00

aleksandr82 [10.1K]4 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] · Answer 2 · 2021-12-17T15:14:17+03:00

guapka [62]4 years ago

7 0

Answer:

-3/5

Step-by-step explanation: