Write a function rule for the total cost.
One frozen yogurt store sells frozen yogurt for $3.00 per cup and $1.25 per topping. Write a linear equation to show the total cost of a cup of frozen yogurt. Then calculate the total price for one cup of frozen yogurt with 4 toppings.
A. y = 1.25x + 3; $5.00
B. y = 3x + 1.25; $13.25
C. y = 1.25x + 3; $8.00
D. y = 5x + 3; $8.00
The correct answer is A.
The function rule for the total cost of a cup of frozen yogurt with x toppings is: y = 1.25x + 3.
To calculate the total price for one cup of frozen yogurt with 4 toppings, we substitute x = 4 into the equation:
y = 1.25(4) + 3
y = 5 + 3
y = $8.00.