Question

Find the output, y, when the input, x, is 7.
y=__

Answer 1

4

Explanation:

You look for the point on the teal line that has an x-coordinate of 7.

You could also go to the point (7,0), which is on the x-axis, and draw an imaginary vertical line and see which point hits it.

Answer 2

y=4

Explanation:

Read off the graph. The corresponding y-coordinate when the x-coordinate is 7 is 4.