Posted by Anonymous on .
Which rectangular equation corresponds to these parametric equations?
x = 0.2sec t and y = 0.25tan t
A) 25x^2 − 16y^2 = 1
B) 25x^2 + 16y^2 = 1
C) x^2 − 16y^2 = 25
D) 25y^2 − 16x^2 = 1
E) 4x^2 − 16x^2 = 1

Math  PreCalc (12th Grade) 
Steve,
since sec^2 = 1+tan^2,
(x/.2)^2 = (y/.25)^2 + 1
25x^2  16y^2 = 1
Looks like A to me