The graph is correct; it represents a linear function. This is because there is a constant pattern between the x and y values.
a) 12 - 1.5 = 10.5>>> and 20 - 2.5 = 17.5>>> and 28 - 3.5 = 24.5
b) This is where the pattern occurs>>> 10.5 + 7 = 17.5, and 17.5 + 7 = 24.5.
The x and y values relate by 7.
