Given the graph of a line:
The rate of change for the function is equal to its slope m
Choose two points to find the rate of change:
Let ( x1, y1 ) = ( 0, 2 )
Let ( x2, y2 ) = ( 2, 5 )
The y-intercept of the line is the point ( 0, 2 ), that is is the initial value
So, b = 2
you already know that m = 3/2
Substitute those values into the slope-intercept form: y = m * x + b
The rate of change for the linear function is 3/2 and its equation is
y = 3/2 x + 2