Need help explaining this please. will medal and fan!!

Question

anonymous · Answer

attachment

anonymous · Answer

Lets label some things here...

anonymous · Answer

Number of packets of vanilla wafers - V
Number of packets of Chocolate wafers - C

So, you get that V+C=27

anonymous · Answer

this is because you bought 27 packets (this is given)

anonymous · Answer

Wouldn't you agree that the total amount spend on Vanilla wafers packets is V•4, or 4V?
(knowing that each vanilla wafers packet is 4$)

anonymous · Answer

And by the same tocken, wouldn't you agree that the total amount spend on Chocolate wafers packets is C•1, or (just) C?
(knowing that each chocolate wafers packet is 1$)

anonymous · Answer

And you have spend a total 45# on wafers, so you have ...

anonymous · Answer

V+C=27      (from previous)
4V+C=45

(First equation is based on the number of packets that is given, and the Second equation is  based on the cost of the packets and the total cost that you are given)

anonymous · Answer

Solve the system and you are done...