Question

The graph represents revenue in dollars as a function of greeting cards sold.

Which equation represents the function shown on the graph?

a. y = x
b. y = x
c. y = 2x
d. y = 4x

Answer 1

d

Explanation:

Answer 2

d. y = 4x

Explanation:

We will use a slope-intercept equation to represent this. These equations are of the form

y = mx + b, where m is the slope and b is the y-intercept.

We can see in the graph that the line crosses the y-axis at 0; this makes 0 the y-intercept.

To find the slope, we find the rise and the run. The line rises 4 and runs 1 between points; this makes the slope 4/1 = 4.

This gives us the equation

y = 4x + 0, or y = 4x.