Which one of the following equations defines y as a function of x ?
A) $y = | x - 7 |$
B) $x = | y |$
C) $y ^ { 2 } = 6 x - 7$
D) $x ^ { 2 } + y ^ { 2 } = 6$

Question

Quizplus · Accepted Answer

In equation A, for each value of x, there is only one corresponding value of y. In the other equations, for certain values of x, there are multiple corresponding values of y, making them not functions.

Which One of the Following Equations Defines Y as a Function