Answer:
A
Step-by-step explanation:
Slope = (3+6)/(-4+1)
= 9/-3
= -3
Y=mx+b
-6= -3×-1 +b
-6 = 3 +b
b = -9
a < 4
7 + a < 11
Subtract 7 from each side
7+a-7 <11-7
hard question
perpendicular (90 deg to each other)