To find the equation that describe the fit, we have to find the slope and the intercept with the y axis, in the graph we can see that the intercept is 62.5 and the slope can be find with this equation:
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]
So we replace two coordinates, so i can see (10, 65) and (40, 75) so:
[tex]m=\frac{75-65}{40-10}=\frac{10}{30}=\frac{5}{15}=\frac{1}{3}[/tex]
So the equation is:
[tex]y=\frac{1}{3}x+62.5[/tex]
