# Which of these equations represent functions where x is the input and y is the output?

## Select each answer that applies A. X=2 B. Y=2 C. Y=2x D. X=2y E. X+y=2

Jul 3, 2018

everybody, except (a)

#### Explanation:

a(x) = ? Vertical line

$b \left(x\right) = 2$

$c \left(x\right) = 2 x$

$d \left(x\right) = \frac{x}{2}$

$e \left(x\right) = 2 - x$