How do you find the cartesian graph of r cos(θ) = 9?

1 Answer
Alan P.
Dec 7, 2015

x=9

Explanation:

cos(theta) = (x_theta)/(sqrt((x_theta)^2+(y_theta)^2))

r= sqrt((x_theta)^2+(y_theta)^2))

Therefore
color(white)("XXX")rcos(theta) = cancel(sqrt((x_theta)^2+(y_theta)^2))xx (x_theta)/(cancel(sqrt((x_theta)^2+(y_theta)^2))

and since r*cos(theta) = 9

color(white)("XXX")x_theta = 9

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