The graph of

[r = -5/(2 cos \theta + sin \theta)]
is a line. Find the y-intercept of this line.

2 answers

Cannot make out your typing
what does "cos \theta" mean ?

is it r = -5( 2cosØ + sinØ) ???

if so, here is the graph:
http://www.wolframalpha.com/input/?i=polar+plot+r+%3D+-5(+2cos%C3%98+%2B+sin%C3%98)

certainly not a line
However,

r = -5/(2cosθ + sinθ)
is a line.

r(2cosθ+sinθ) = -5
2x+y = -5

Now the intercept isn't so hard to find, eh?