The functions are
and
.
Find the points using the values
and
.
From the values, the graph of r is passes through the points
and
.
Find the slope m of the linear function
s graph using the points.
So, the slope 



.
Find y-intercept b of function
s graph.
Since graph r passing through
, So
.
Write the linear function in the form
.
.
The linear function is
.