Pls help me i need to finish this assignment

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  19) x = number of people; y = cost

  20) (people, cost) = (15, 120) and (25, 200)

  21) the rate of change is $8 per person

  22) y = 8x

  23) $320

Step-by-step explanation:

19) The problem statement tells you x is the number of people and y is the cost.

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20) Writing the pairs (people, cost), we have ...

  (15, 120) and (25, 200)

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21) The rate of change can be found from the slope formula:

  m = (y2 -y1)/(x2 -x1)

  m = (200 -120)/(25 -15) = 80/10 = 8

The rate of change is $8 per person.

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22) In point-slope form, the rule is ...

  y -y1 = m(x -x1)

  y -120 = 8(x -15)

  y = 8x -120 +120

  y = 8x

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23) For x=40, y = 8(40) = 320

A party for 40 people will cost $320.

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step-by-step explanation:

answer: it depends on what the tax percentage