How do you convert $x+2y-4=0$ into a polar equation?

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Answer 1 · 2015-11-27T22:07:52

Use the following identities ...

$x=rcostheta$
$y=rsintheta$

Using the above identities, substitute into the original equation ...

$rcostheta+2rsintheta=4$

Next, solve for r ...

$r=4/(costheta+2sintheta$

hope that helped

How do you convert x+2y-4=0x+2y-4=0 into a polar equation?