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Mathematics, 11.12.2020 01:30 morgans53005

Mark bought gifts for his friends, and each gift cost $9. Let y represent the total cost and 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. (20 points) a
y = 8x

b
y = one-eighth x

c
y = 9x

d
y = one-ninth x

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