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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?

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  • ted s
    Lv 7
    1 month ago

    unit circle , 2nd quadrant, and x = - 1 / √2 ===> y =  1 / √2

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  • 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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