Question

What is the range of the function `2x + y = 7` if the domain is (-4, -2, 0, 5, 7)?

Answer 1

`(-7,-3,7,11,15)`

Explanation:

Since it is not clear which the independent variable is, we will assume that the function is

`y(x) = 7 - 2x` and NOT `x(y) = (7-y)/2`

In this case, simply evaluate the function at each `x` value of the domain:

`y(-4) = 15`
`y(-2) = 11`
`y(0) = 7`
`y(5) = -3`
`y(7) = -7`

Therefore, the range is `(-7,-3,7,11,15)`.