## Precalculus (6th Edition)

(a) slope $=2$ (b) Refer to the graph below.
RECALL: In the linear equation $y=mx + b$, $m$=slope and $(0, b)$ is the y-intercept. (a) The line $y=2x-4$ has a slope of $2$ and a y-intercept of $(0, -4)$. (b) To graph the line, perform the following steps: (1) Plot the y-intercept $(0, -4)$. (2) Use the slope to plot another point. The slope is $2$ so there is a 2-unit increase in the value of $y$ for every unit increase in $x$. From $(0, -4)$, move 2 units up (the rise) and one unit to the right (the run) to reach $(1, -2)$. Plot $(1, -2)$. (3) Complete the graph by connecting the two points using a line. (Refer to the graph in the answer part above.)