Slope of line perpendicular to ax+by=c is b/a
given
-2x-8y=18
slope of perpendicular is -8/-2=4
y=4x+b
find B
(4,5)
x=4,y=5
5=4(5)+b
5=20+b
minus 20
-15=b
y=4x-15
Answer:
I would say the answer is A
We know that AD is the same length as DC, so therefore we can say:
y+6=2y
Move y over to the right side of the equation
6=y
Since DC is equal to 2y, DC would equal 6x2=12