# Precal help asap!?

If (x, y) is a point on the unit circle in quadrant II and if x=- Root 2 /2

, what is y?

### 2 Answers

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- ted sLv 72 months ago
unit circle , 2nd quadrant, and x = - 1 / √2 ===> y = 1 / √2

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- 2 months ago
x^2 + y^2 = 1

y will be positive

(-sqrt(2)/2)^2 + y^2 = 1

1/2 + y^2 = 1

y^2 = 1/2

y^2 = 2/4

y = +/- sqrt(2) / 2

y = sqrt(2)/2

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