Question

A circle is represented by the equation x2+y2=445. a) State the radius. b) Find y if point A(-9,y) is on this circle.

Answer 1

R= sqrt 445

Y = 19

Explanation:

Radius is the square root of 445

Find y

So, First step is to substitute what you have

-9^2 + y^2 = 445

81 + y^2 = 445

-81 -81

y^2 =364

Y is about 19

Let me know if I'm incorrect

Hope this helps :)