Would someone mind helping me to understand how to find the answer to this problem? Thank you!

Calcgirl77 Aug 15, 2018

#1**+2 **

r = 5 / [ 1 + cos θ]

Note : r = √ [ x^2 + y^2] and cos θ = x / r

So we have

r = 5 / [ 1 + x/r ]

r [ 1 + x / r] = 5

r + x = 5

√ [ x^2 + y^2] + x = 5 subtract x from both sides

√ [ x^2 + y^2] = 5 - x square both sides

x^2 + y^2 = 25 - 10x + x^2 subtract x^2 from both sides

y^2 = 25 - 10x

CPhill Aug 15, 2018