Question

How do you write the equation `21x+20y=87` in polar form?

Answer 1

`r=87/(21costheta+20sintheta)`

Explanation:

To convert from `color(blue)"cartesian to polar form"`

`color(orange)"Reminder " color(red)(bar(ul(|color(white)(2/2)color(black)(x=rcostheta , y=rsintheta)color(white)(2/2)|)))`

`rArr21rcostheta+20rsintheta=87`

`rArrr(21costheta+20sintheta)=87`

`rArrr=87/(21costheta+20sintheta)`