Question

Mark bought gifts for his friends, and each gift cost nine dollars (y). Represent the total cost (T) and let X represent the number of gifts. Write an equation to represent the proportional relationship between the total cost and the number of gifts he bought.

a) T = 9X
b) T = 9/y
c) T = 9X^2
d) T = X/y

Answer 1

The equation that represents the proportional relationship between the total cost (T) and the number of gifts (X) is T = 9X.

Step-by-step explanation:

The equation that represents the proportional relationship between the total cost (T) and the number of gifts (X) is T = 9X. Here, the coefficient of X (9) represents the cost of each gift, and X represents the number of gifts bought. By multiplying the cost of each gift by the number of gifts bought, we get the total cost. For example, if Mark bought 5 gifts, the equation would be T = 9 * 5 = 45. So, the total cost of the gifts would be 45 dollars.