Answer
Refer to the line y = 2x – 5 in Graph I, it is a function.
The domain is $(-\infty, \infty)$, and
the range is $(-\infty, \infty)$.
Work Step by Step
Refer to the line y = 2x – 5 in Graph I, it is a function because
one value of y can always be found by taking 5 from each value of 2x, and,
by way of Vertical Line Test, each vertical line drawn will not intersect the line on the graph in more than one point, so, the equation defines a function further.
x can be represented by any real number with domain = $(-\infty, \infty)$, and
y can be any real number with range = $(-\infty, \infty)$.
