BRAINLIEST PLS HELPpp

Answer:
undefined
Step-by-step explanation:
Given ( -1 , 0) = ( x1 , y1) and ( -1 , 6) = ( x2 , y2)
slope (m)
=( y2 - y1 ) / (x2 - x1)
= ( 6 - 0) / ( -1 +1)
= 6/ 0
= undefined