Answer:
Step-by-step explanation:
9y + 12 = 4y - 10
Sub. 4y from both sides
5y + 12 = 10
Sub. 12 from both sides
5y = -2
Divide 5from both sides
y = -2/5
Substitute -2/5 into 4y - 10
Juan have to print 9 photos.
<u><em>Explanation</em></u>
Suppose, Juan have to print
number of photos.
First photo shop charges $0.36 per print. So, the total cost to print
number of photos in this shop
dollar.
Second photo shop charges $2.52 plus $0.08 per print. So, the total cost for printing
number of photos 
As, the cost of printing is the same at both shops, so.....

So, Juan have to print 9 photos.
Answer:
28%
Step-by-step explanation:
total percent is 100%
we could rewrite the equation as:
48% + 24% + f = 100%
72% + f = 100%(subtract 72 on both side)
f = 28%
Z = 4 , w = 6
z = x , w = 8
Therefore, z = (4*8) / 6
= 32 / 6
= 16/3 = 5.333