Algebra: A Combined Approach (4th Edition)

the graph has a vertical line with x-intercept 2. Find pair solutions of x=2. We let ($x_{1},y_{1}$)=(2,0) and ($x_{2},y_{2}$)=(2,1) m=$\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$=$\frac{1-0}{2-2}$=$\frac{1}{0}$ Since $\frac{1}{0}$ is undefined, the slope of x=2 is undefined