Determine whether or not each relationship represents a function. explain your reasoning.
(-2,5)
(-1,10)
(0,15)
(-1,20)

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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susie has 7 apples