Question

Graph the line that passes through the points left parenthesis, minus, 3, comma, minus, 1, right parenthesis(−3,−1) and left parenthesis, 1, comma, minus, 1, right parenthesis(1,−1) and determine the equation of the line.

Answer 1

First find the slope:
m = (−1 − (−1)) / (1 − (−3)) = 0 / 4 = 0.

A slope of 0 is a horizontal line through y = −1. So the equation is
y = −1.

To graph: plot the points (−3, −1) and (1, −1) and draw the horizontal line through them (all points with y = −1).