Plz explain step by step, i'm taking adv. math (algebra) it's confusing if can't explain, plz at least give right answer ✌

perpendicular lines have negative reciprocal slopes

since x=4 has a zero slope

the slope will be undefined or y= something

since it passes thru (3.5)

y=5

Choice A

points that are on x=5 must have the x coordinate = to 5

(5, something)

Choice B  (5,0) (5,-2)

Parallel lines have the same slope x=7 has a slope of zero

so it must be a horizontal line   x = something

it can't equal y because then the slope is 1

x must equal 4

Choice D

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x