Answer:
$0.25
Step-by-step explanation:
Ok. You have to set up a system of equations that describe the situation and solve these equations. You are given some informations.
1. The price of a Petunia. Let' s give that a label and call it P.
2. The money left after the purchase. Let's call that number M.
3. The amount of money Ying Ying has in her wallet. Let's call that X.
Now you can form an equation: X = nP + M
Meaning: The money Ying Ying has in her wallet is equal to the value of n Petunias and $M left in her wallet. n and M are given in the table.
If Ying Ying buys 2 Petunias, she has $2 left in her wallet. If I have to describe this in an equation, I would write:
X = 2P + 6.5
All equations would look like this:
X = 2P + 6.5
X = 8P + 5
X = 14P + 3.5
Now you have 3 equations with only 2 unknowns, which can be solved for X and P.
X = 7 and P = 0.25
