The graph below shows the amount of money left in the school’s desk fund, f, after d desks have been purchased.
a graph titled desk fund amount. the horizontal axis shows the number of desks purchased (d), numbered 1 to 9, and the vertical axis shows the dollars left in fund (f) numbered 100 to 800. blue diamonds appear at points (0, 700), (1, 590), (2, 480), (3, 370), (4, 260), (5, 150), (6, 40).
for each new desk that is purchased, by how much does the amount of money left in the school’s desk fund decrease?

$ 110

Step-by-step explanation:

The points on the graph are:

(0, 700), (1, 590), (2, 480), (3, 370), (4, 260), (5, 150), (6, 40)

Since, the x-axis represents the number of desks purchased and y-axis represent the amount left in the fund, the first point in the above pairs represent the number of desks purchased and second point represents the amount left in the funds after purchasing that many desks.

The first pair: (0, 700)

This shows when no desk is purchased the amount in the college fund is $ 700.

The second pair: (1, 590)

This shows when 1 desk is purchased, the amount in the college fund is reduced to $ 590.

So, the decrease in the desk fund after purchasing 1 desk = $700 - $590 = $ 110

Any two pairs from the given ordered points can be used to find this number, the result will be the same in all cases.

So, for each new desk that is purchased, the amount of money left in the school’s desk fund decreased by $ 110.

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