Question

Does the equation x2 + y = 169 define y as a function of x?

Answer 1

Yes, this is a function. This is a function because there are no repeating x values. This can be seen using the vertical line test.

Answer 2

Y=169-x^2
We subtract x^2 both sides
X^2-x^2+y=169-x^2
Y=169-x^2