Answer:
Where is the model ?
Step-by-step explanation:
Find midpoint of segment.
(-1,1), (7,-5)

Find slope of line which passes through (-1,1) and (7,-5).

The slope of perpendicular line is negative reciprocal value of m.

Write quation of line which slope is

and passes throug the point (3,-2).
Here’s the correct answer and how I got the answer :)
Answer:
3
Step-by-step explanation:
First we must find the total boxes of pens
15 + 9 = 24
Then we can divide the total cost by the total number of boxes of pens
$72 / 24 boxes = 3
39-(15z+48)/27=35
39-35=(15z+48)/27
4=(15z+48)/27
108=15z+48
108-48=15z
60=15z
z=60/15
z=4