The rate of change is
and the initial value is 0.
To find the rate of change (slope) of the linear function from the graph, you can use the formula:
![\[ \text{Slope (m)} = \frac{\text{Change in y}}{\text{Change in x}} = (y_2 - y_1)/(x_2 - x_1) \]](https://img.qammunity.org/2022/formulas/mathematics/high-school/9rws8tg20472muqwj34gqb5qpthj16ehla.png)
From the graph, you need to select two points that the line passes through. Let's say we select the points (2, 1) and (7, 4).
Using these two points:
![\[ m = (4 - 1)/(7 - 2) = (3)/(5) \]](https://img.qammunity.org/2022/formulas/mathematics/high-school/lc24zrvffyb6rpo66tk8djro7c4tjhvi1d.png)
So, the rate of change (slope) is

The initial value (y-intercept) is the value of y when x=0. Looking at the graph, the y-intercept appears to be at (0, 0).