# Math Help - Finding domain

1. ## Finding domain

What is the domain of this relation?

x² + 16y² = 16

Thanks.

2. Originally Posted by shenton
What is the domain of this relation?

x² + 16y² = 16

Thanks.
Divide by 16,

x²/16 +y^2=1

Thus,

x^2/4^2+y^2/1^2=1

This is an ellipse with vertical length of 4.

Thus, the domain (the x part, which is vertical):
-4<=x<=4