Question

Which rectangular equation is equivalent to the polar equation r cos theta=8?

A. x= 8y^2

B. y=8

C. x=8

D.x^2+ (y-4)^2=16

Answer 1

i believe C
since cos(theta)=x/r
and rcos(thea)=x

Answer 2

Look at your basic transformations:
x = r sin θ
y = r cos θ

It follows immediately that this is y=8