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Help plssssssss thanks 15 points

Help plssssssss thanks 15 points-example-1
User Tom Johns
by
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1 Answer

4 votes

Explanation:

before buying any songs (0 number of songs) she has $50.

after buying 5 songs she has $37.50 left.

after buying 10 songs she has $25 left.

so, we see, each song costs $2.50 (5×2.5 = 12.5, 50-12.5 = 37.5, 10×2.5 = 25, 50 - 25 = 25).

that ratio continues also for 15 and 20 songs.

so, yes, the problem definition is right, it is a linear function.

the function is

m(x) = y = 50 - 2.5x

"m" standing for "money left".

x = number of songs bought.

the y-intercept is the y-value, when x = 0.

that is in our case 50. or $50.

that stands in this case (as the first sentence in this explanation shows) for the initial amount of money she had before buying any songs.

User Vasfed
by
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