Solving MCAS Open Response Questions By Lawrence Scandone

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Solving MCAS Open Response QuestionsBy Lawrence
Scandone
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READ THE QUESTION
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Read it Again
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What info have I been given?

• 1st 200 dollar expence for equipment.
• 2nd Rodney earns 40 dollars for each horse that
  he grooms.
• 3rd Profit is equal to his earnings for each
  horse groomed minus the initial expense.

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What is the profit for grooming 15 horses?

• 1st Rodney earns 40 dollars for each horse
  groomed.
• 2nd He groomed 15 horses.
• 3rd So I multiply 40 x 15 which is 600.
• 4th Since profit I E P 600 - 200
• Profit 400

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Graph Title
Title______________________________
__
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Label the X-axis
Name_______________________________
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Label the Y- axis
Name
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Plot the Profit for 0 to 7 horses

• X of horses
• Groomed (0 to 7)
• Y Rodneys profit

Y
200
0
X
2
4
6
8
-200
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Write the equation

• Y mX b
• 1st ask yourself what m __
• 2nd ask yourself what b __

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M stands for the slope

• Its equal to the rise/ run or the rate of change
  which is 40.

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B stands for the Y-intercept

• Its where the graph crosses the y- axis or in
  this case a one time charge, which is the
  starting value.

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Replace m and b

• You plug 40 in for m and you replace b with (-
  200).
• Y 40X 200 is the equation

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What does the X-interceptrepresent?

• Think about money!
• What is Rodneys profit at the X-intercept?
• How many horses did he groom at the
• X-intercept
• Show and explain your answer for this point on
  the graph. What does it stand for in terms of
  Rodneys business?

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