Chapter 3.1, Problem 18SBE

Slopes of Lines in the Coordinate Plane For Exercises $\text{S-14}$ through $\text{S-25,}$ use the fact that for points $(a_1,b_1)$ and $(a_2,b_2)$ in the coordinate plane, we can calculate the slope of the line through these points using

Slope = $\frac{\Delta y}{\Delta x}=\frac{b_2-b_1}{a_2-a_1}.$

Find the point where the line through $(1,4)$ with slope $-2$ crosses the horizontal axis. (Suggestion: The line must fall by $4$ units to reach the horizontal axis.)