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The cost of paper varies directly with the number of reams bought. Suppose 2 reams cost $5.10. Write a linear equation that could be used to find the cost of x reams of paper. Find the cost of 15 reams of paper

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creamcheesebun

let x be the number of reams of paper and $y be the cost.

y=kx

when x=2, y=5.10,

5.10=k(2)

2k=5.10

k=2.55

y=2.55x

cost of 15 reams of paoer= 2.55(15)= 38.25

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