Answer:
C
Step-by-step explanation:
Let's set up a simultaneously equation to solve for two unknows.
Let x be the cost of cheese pizza
Let y be the cost of mushroom pizza
"Jack bought 3 slices of pizza and 4 slices f mushroom pizza for a total cost of $12.50."
Therefore,
3x + 4y = 12.50 (Equation 1)
"Grace bought 3 slices of cheese pizza and 2 slices of mushroom pizza for a total cost of 8.50."
Therefore,
3x + 2y = 8.5 (Equation 2)
From equation 1, let's solve for x in terms of y
3x + 4y = 12.50
3x = 12.50 - 4y
[tex]y = \frac{12.50-4y}{3}[/tex]
Plug in this y value into equation 2, we have:
[tex]3(\frac{12.50-4y}{3}) + 2y = 8.5[/tex]
We will get that y = 2
Hence, option C is the answer.
