### Home > CCA > Chapter 2 > Lesson 2.1.4 > Problem 2-42

2-42.

Without graphing, find the slope of each line described below.

A line that goes through the points

and . Use a slope triangle or another method to determine the slope of the line.

Another method is to first subtract the

-values and the-values from each other.

Substitute the differences into the slope formula.

A line that goes through the origin and the point

See part (a).

A vertical line (one that travels “up and down”) that goes through the point

. Vertical lines have an undefined slope.

A line that goes through the points

and .

See part (a).