To get the equation for pipers earnings we use
[tex]y-y_1=\text{ (}\frac{y_2-y_1}{x_2-x_2})(x-x_1)_{}[/tex]
y1 = 259
y2 =518
x1=10
x2 = 20
[tex]\begin{gathered} so \\ y\text{ -259 = (}\frac{518-259}{20-10})(x-10) \\ y\text{ - 259 =25.9x-259} \\ y\text{ =25.9x} \end{gathered}[/tex]
So the difference between Piper's earning and Robert's earning is 25.9x - 24.7x =1.2x
So, Piper earns $1.2 per hour more than Robert
