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 (1, 4) and (2, 8) from the graph.

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, $x_1 = 1,y_1=4,x_2 = 2,y_2 = 8$. So $m=\frac{8 - 4}{2 - 1}=\frac{4}{1}=4$.

Step3: Determine the equation of the line

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

Answer:

$y = 4x$