Question

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Using Linear Models to Solve Problems

If Rick buys 50 tennis balls, he pays $30. If he buys only 40 tennis balls from the same store, he pays $20. Assuming that the pricing follows a linear model, what is the model?

A. y-10=1(x-10)
B. y-50=1(x-30)
C. y-50=2(x-30)
D. y-20=2(x-20)

Answer 1

B:D