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Solving MCAS Open Response Questions By Lawrence Scandone.

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Presentation on theme: "Solving MCAS Open Response Questions By Lawrence Scandone."— Presentation transcript:

1 Solving MCAS Open Response Questions By Lawrence Scandone

2 READ THE QUESTION

3 Read it Again

4 What info have I been given? 1 st $200 dollar expence for equipment. 2 nd Rodney earns $40 dollars for each horse that he grooms. 3 rd Profit is equal to his earnings for each horse groomed minus the initial expense.

5 What is the profit for grooming 15 horses? 1 st Rodney earns $40 dollars for each horse groomed. 2 nd He groomed 15 horses. 3 rd So I multiply $40 x 15 which is $ th Since profit = I – E { P = $600 - $200 } Profit = $400

6 Graph Title Title:________________________________

7 Label the X-axis Name:_______________________________

8 Label the Y- axis Name:

9 Plot the Profit for 0 to 7 horses X = # of horses Groomed (0 to 7) Y =Rodney’s profit 0X Y

10 Write the equation Y = mX + b 1 st ask yourself what m =__ 2 nd ask yourself what b =__

11 M stands for the slope It’s equal to the rise/ run or the rate of change which is $40.

12 B stands for the Y-intercept It’s where the graph crosses the y- axis or in this case a one time charge, which is the starting value.

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

14 What does the X-intercept represent? Think about money! What is Rodney’s 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 Rodney’s business?

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