Answer:
Hey there. Ur answer is x-5y
Step-by-step explanation:
When you know the coordinates of a point and the slope of a line, you can use the formula

in your case,
and
, so you have

N= 13*c+8
n=15*c
15c=13c+8
15c-13c=8
2c=8
c=8:2
c=4 children
n= 15*4=60 notebooks