Question

Which rectangular equation is equivalent to the polar equation r cos(theta)=-2?

Answer 1

r cosθ = −2

I think the answer is:

B. x = −2

Answer 2

yep, this goes back to what we worked on yesterday

Answer 3

Ok thanks I was just wondering why its x=-2 and not y=-2 I just got confused by that?

Answer 4

because

x = r*cos(theta)
y = r*sin(theta)

Answer 5

x and cos correspond
y and sin correspond

Answer 6

think of the unit circle

Answer 7

Ok thank you :)

Answer 8

np