Step-by-step explanation:
As
- The graph of the function passes through the point (2,1), and
- y increases by 4 when x increases by 1.
so
x y
2 1
3 5
4 9
5 13
6 17
and so on
From the table:




As the slope-intercept form of the line is

putting m=4 and any point, let say (2, 1) to find y-intercept 'b'.




So putting
and
in the slope-intercept form of the line


Therefore, the equation for the linear function will be:

My explanation is attached below.
The total cost was 116% of the original bill;
Original bill was;

= <span>$22.5</span>
y + 2007 = 5/29x
5/29 is the slope and 2007 is the y-intercept