Question

Two friends, Piper and Robert, took summer jobs.The equation y=24.7 x Really Robert's earnings in dollars and cents, y , for working x hours . The table below represents piper's earnings in dollars and cents ,y, for working x hours.

Answer 1

To get the equation for pipers earnings we use

`y-y_1=\text{ (}(y_2-y_1)/(x_2-x_2))(x-x_1)_{}`

y1 = 259

y2 =518

x1=10

x2 = 20

`\begin{gathered} so \\ y\text{ -259 = (}(518-259)/(20-10))(x-10) \\ y\text{ - 259 =25.9x-259} \\ y\text{ =25.9x} \end{gathered}`

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