# The equivalent polar equation for the given rectangular - coordinate equation. y= -3

The equivalent polar equation for the given rectangular - coordinate equation.
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Obiajulu
Concepts used: Conversion formula for coordinate systems are given as:
a) From polar to rectangular:
$x=r\mathrm{cos}\theta$
$y=r\mathrm{sin}\theta$
b) From rectangular to polar:

Calcculation:
Converting into equivalent polar equation:

Put

Hence, desired equivalent polar equation would be