Part A
Her pay increase for each hour worked is;
From the graph, we need to look at the x-axis and y-axis to compare the hours worked and the pay
After 1hour, her pay is $80
After 2hours, her pay is $140.
After 3hours, her pay is $200.
Hence, from the above we see that her pay increase for each hour worked is 140 - 80 or 200 - 140 = $60.
Part B
The slope of the line is;
![\begin{gathered} m=(y_2-y_1)/(x_2-x_1) \\ \text{when we pick two points, hour 1 and hour 2 on the x-axis, and get the corresponding pay for each hour on the y-a}\xi s \\ \text{Thus we have it that,} \\ m=(140-80)/(2-1) \\ m=(60)/(1) \\ m=60 \end{gathered}]()
The slope of the line, therefore, is 60 $/hr