HELP PLZZZZ

At the local pet store, zebra fish cost $2.10 each and neon tetras cost $1.85 each. If Mary bought 15 fish for a total cost of $29.75, not including tax, how many of each type of fish did she buy? Fill in the blanks below.

Question

HELP PLZZZZ
	

At the local pet store, zebra fish cost $2.10 each and neon tetras cost $1.85 each.  If Mary bought 15 fish for a total cost of $29.75, not including tax, how many of each type of fish did she buy?  Fill in the blanks below.

anonymous · Answer

how many zebra fish and  neon tetras

anonymous · Answer

and ill fan and medal

btaylor · Answer

You have to make a system.
Let Z = number of zebra fish
Let N = number of neon tetras.

Z+N=15
2.1Z+1.85N=29.75

multiply first one by -1.85:
-1.85 Z-1.85 N = -27.75
2.1 Z + 1.85 N = 29.75
____________________________
.25 Z                   = 2.00
Z = 8
N = 7

anonymous · Answer

thxx