d(t)=50t+300 is the equation if a line with a slope of 50 and y-intercept of 300.
To find the slope of the plot, locate two points (x1, y1) and (x2,y2) and compute it using the next formula:
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]If the plot is a line, has a slope equal to 50 and the line intersects the y-axis at (0,300), then it's the plot of d(t)=50t+300
