Question

What's the polar form of the equation: 9x+12y+7=0? (I say it's b)
a- r= -7/3(3sen(angle)+4cos(angle))
b- r= -7/3(3cos(angle)+4sen(angle))
c- r= -2/3(3sen(angle)+4cos(angle))
d- r= 2/3(3sen(angle)+4cos(angle))

I'll attach the picture of the four equations so you can see them better