Question

The ellipse (x^2)/25 + (y^2)/36 = 1 , can be drawn with parametric equations. If x = r cos(t)

what's r and y??

Answer 1

Fruitless answerer:
x=5*cos(t)
y=+-(6/5)*sqrt(25-x^2)

thank you

Answer 2

do you know where x = rcost comes from?
think about x^2 + y^2 = r^2
and cos^2t + sin^2t = 1

Answer 3

r is 5
x = 5 * cos(t)

so y = +-(6/5)*sqrt(25-(5*cos(t))^2)

Answer 4

x=5cos(t)
y=5sin(t)

Answer 5

sont know why frutless has given a mess for the value of y, it should be expressed in terms of the parameter as well