Answer:
Step-by-step explanation:
Given
Midpoint is 
Endpoints are
and 
Mid point of any two point is given by

and 
So,


Also



Therefore 
Answer:
y = -4x - 6
Step-by-step explanation:
12x + 3y = -18
Solve for y.
3y = -12x - 18
y = -12/3 x - 18/3
y = -4x - 6
Answer: width= 5cm Length= 7
Step-by-step explanation: