Respuesta :
Slope = y2-y1/ x2-x1
Here x1 is 4
Y1 is -7
X2 is 4
Y2is 8
Slope = 8-(-7)/4-4
= 15/0
Undefined
The best and most correct answer among the choices provided by your question is the second choice or letter B. The slope of line CD is undefined.
By two-point slope form:
m=(y2-y1)/(x2-x1)
m=(8+7)/(4-4)
m=15/0 (undefined)
I hope my answer has come to your help. Thank you for posting your question here in Brainly.