The point-slope formula:

We have the points (-4, -1) and (5, 7).
Substitute:

-4.5
Step-by-step explanation:
the point P is at the midpoint of -4 and -5
Answer:
x=-2
y= 8
Step-by-step explanation:
Given data
10x – 2y = -36-----------1
7x – 2y = -30--------------2
-Subtract to eliminate y
3x-0= -6
3x= -6
x= -6/3
x= -2
Put x= -2 in
7(-2)– 2y = -30
-14-2y=-30
-14+30=2y
16=2y
y= 16/2
y= 8
The answer is Lucy should be allowed to drink 1.25 ounces a day.