## College Algebra (10th Edition)

RECALL: (1) The slope-intercept form of a line's equation is: $y=mx+b$ where $m$ = slope and $b$ = y-intercept (2) Parallel lines have equal slopes. (3) Perpendicular lines have slopes whose product is $-1$. The equations are in slope-intercept form. The first line has $m=4$ while the second line has $m=-4$. The slopes are not equal. The product of the slopes is $-16$. Thus, the lines are neither parallel nor perpendicular to each other.