the graph represents revenue in dollars as a function of greeting cards sold. which equation represents the…

Explanation:

Step1: Find two points on the line

Let's take the points (0, 0) and (5, 20).

Step2: Calculate the slope

The slope $m$ of a line passing through two points $(x_1,y_1)$ and $(x_2,y_2)$ is given by $m=\frac{y_2 - y_1}{x_2 - x_1}$. Here, $x_1 = 0,y_1=0,x_2 = 5,y_2 = 20$. So $m=\frac{20 - 0}{5 - 0}=\frac{20}{5}=4$.

Step3: Determine the equation of the line

The equation of a line in slope - intercept form is $y=mx + b$, where $m$ is the slope and $b$ is the y - intercept. Since the line passes through the origin $(0,0)$, $b = 0$. So the equation is $y=4x$.

Answer:

$y = 4x$