Medal award! A point (x,y) is on the unit circle. If it's y-coordinate is -12/13 and the point lies in quadrant 4, what is the other coordinate? Express your answer as a reduced fraction, no decimals!

Question

anonymous · Answer

|dw:1444005680956:dw|

anonymous · Answer

you are there
is the x coordinate positive or negative?

anonymous · Answer

oh I got it! :)

jim_thompson5910 · Answer

hopefully you have in your lesson/notes somewhere that $\Large x^2 + y^2 = 1$ is the unit circle equation. Plug in y = -12/13 and solve for x (keep satellite73's drawing in mind)