Slope from two points
(20, 8), (9, 16)
y=3x+5
y=3x-6
Parallel
y=3x+5
any equation with 3 as the slope!
y=2x+5
anything with -1/2 as the slope
(12, 2), (−7, 5)
-3/19
y=3/4x-5
y=-4/3x+3
y=2/3x+5 that passes through (-6,2)
y=2/3x+6
y=1/2x+5 that passes through (-1,7)
y=-2x+5
(3, −20), (5, 8)
28/2 = 14
y=3x+5
y=4x-4
neither
y=4x+7 that passes through (-1,-1)
y=4x+3
What are the two ways to show two lines are perpendicular?
Their slopes multiply to -1.
Their lines form 90 degree angles.
(19, 3), (20, 3)
0/1 = zero
y=3x+5
y-3x=4
parallel
-3x+y=8 that passes through (1,8)
y=3x+5
y=3/4x+7 that passes through (-3,5)
y=-4/3x+1
(17, −13), (17, 8)
undefined
x + 2y = -6
-2x + y = 2
perpendicular
2y-3x=7 that passes through (4,8)
y=3/2x+2
2y-x=4 and passes through (-4,4)
y=-2x-4