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Answer 1 · 2017-09-12T21:14:40

see below

Use the formulas #x=rcos theta, y=r sin theta# and substitute into the given equation for x and y.

That is,

#x+5y=3#

#rcos theta+5rsin theta =3#

#rcos theta+5rsin theta -3 = 0#

or

#r(cos theta+5sin theta)=3#

#r=3/(cos theta + 5 sin theta)#