If Two Points on a Line Are X = 2

Essay

If two points on a line are x = 2, y = 5 and x = 7, y= 10, what is the slope of this line?
$$\begin{array} { | l | l | } \hline \begin{array} { l } \text { Katie's income } \\\text { (dollars per year) }\end{array} & \begin{array} { l } \text { Katie's purchases } \\\text { (books peryear) }\end{array} \\\hline 50,000 & 14 \\\hline 70,000 & 16 \\\hline 90,000 & 18 \\\hline 110,000 & 20 \\\hline\end{array}$$