91影视

Pair of lines:

鈸� $y=8$and $y=-6$

鈸� $x=1$and $x=-5$

Use slopes and y-intercepts to determine if the lines are parallel

鈸� We recognize right away from the equations that these are horizontal lines, and so we know their slopes are both 0. Since the horizontal lines cross the y-axis at $y=8$and at $y=-6$, we know the y-intercepts are $(0,8)$and $(0,-6)$. The lines have the same slope and different y-intercepts and so they are parallel.

鈸� We recognize right away from the equations that these are vertical lines, and so we know their slopes are undefined. Since the vertical lines cross the x-axis at $x=1$and $x=-5$, we know the y-intercepts are $(1,0)$and $(-5,0)$. The lines are vertical and have different x-intercepts and so they are parallel.