Question

A point P is often identified in mathematics using the notation P(x,y) to reference a point at coordinates (x,y).
If P(x,13/16) is on the unit circle in quadrant II, then x=

Answer 1

if P is on the unit circle, then x^2 + y^2 = 1

y = 13/16

Answer 2

since the point is in quadrant 2, it means x < 0

Answer 3

yeah that's where i went wrong. i forgot to make it negative. thanks

Answer 4

you're welcome