Chapter 8.3B, Problem 22A

To determine

a.

The equation $x-y=2$ is function or not.

To determine

b.

The inequality $x+y<20$ is a function or not.

To determine

c.

The equation $y=2x^2$ is a function or not.

To determine

d.

The equation $y=x^3-1$ is a function or not.

To determine

e.

The equation $y=-\left|x\right|$ is a function or not.

To determine

f.

The equation $\left|y\right|=\left|x\right|$ is a function or not.

To determine

g.

The equation $x^2-y^2=1$ is a function or not.

To determine

h.

The equation $y=-\sqrt{x}$ is function or not.