# 5999b Skills Check For Sac - Chapters 16, 17 & 18

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Anthony Nunan
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Quizzes Created: 132 | Total Attempts: 45,001
Questions: 22 | Attempts: 91

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Check your skills on this quiz - look at the explanations on the questions you get wrong, and see me about things you don't understand.
There is also a written section to this quiz. You will need to complete it, and have it corrected, before you sit the SAC.

• 1.

### 2x+2y=3What is the gradient of the equation above?

Explanation
App - equationlinear - go across to page 1.5

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• 2.

### 2x+2y=3What is the y intercept of the equation above?

Explanation
App - equationlinear - go across to page 1.5

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• 3.

### 2x+2y=3Rearrange the equation above to General Form? (y=a+bx)

Explanation
App - equationlinear - go across to page 1.5
makesubject will do the same thing

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• 4.

### A line has a gradient of 4 and passes through the point (1, 2). What is the equation of the line in General Form? y=a+bx

Explanation

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• 5.

### What is the equation for the line above? (y=a+bx)

Explanation
twopoints or intercepts should give the answer

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• 6.

### What is the equation for the line above?

Explanation
Apps don't help with vertical and horizontal lines. You have to know them. Vertical is x=, horizontal is y=

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• 7.

### What is the point of intersection between the lines that define the two inequalties above?

Explanation
Answer in coordinate form should be (-3, 3). Other variations are INCORRECT, but have not been penalised.

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• 8.

### What is the equation of the line that passes through the point (2, 5) and is parallel to the equation y=-0.5x+5?

Explanation
makesubject will give you the parallel gradient - so will equationlinear.
Then - you can use gradpoint to find the equation.

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• 9.

### From the graph above, is the origin included in the feasible region?

• A.

No

• B.

Yes

A. No
Explanation
The origin is (0, 0) and it is not coloured in, so, its not in the feasible region.

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• 10.

### WebDev is a web building company. It sells websites for \$850 per annum.The running costs for the business are \$12000 per annum, and each site they sell costs \$300 in design and other services.How much money does WebDev need to make each year before it starts to make a profit?

\$18700
Explanation
Breakeven app ... NOTE ... you must use the Integer values when the data is discrete.

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• 11.

### WebDev is a web building company. It sells websites for \$850 per annum.The running costs for the business are \$12000 per annum, and each site they sell costs \$300 in design and other services.How many websites does WebDev need to sell each year before it starts to make a profit?

22
Explanation
Breakeven app ... NOTE ... you must use the Integer values when the data is discrete.

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• 12.

### WebDev is a web building company. It sells websites for \$850 per annum.The running costs for the business are \$12000 per annum, and each site they sell costs \$300 in design and other services.If they make a profit of approximately \$30000, how many sites did they sell?

76
Explanation
Breakeven populates the memory with the retail, fixed and variable costs.
profitloss will then give you the values for profit - units is the number of units sold, profit is the amount of profit made (it can be negative - that's a loss) and Revenue tells you how much money was made before costs.

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• 13.

### WebDev is a web building company. It sells websites for \$850 per annum.The running costs for the business are \$12000 per annum, and each site they sell costs \$300 in design and other services.If the revenue is \$95000 how much profit will they make?

\$49600
Explanation
Breakeven populates the memory with the retail, fixed and variable costs.
profitloss will then give you the values for profit - units is the number of units sold, profit is the amount of profit made (it can be negative - that's a loss) and Revenue tells you how much money was made before costs.

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• 14.

### What is the value of 'n' for the graph above?

3
Explanation
Use your chart - match the shape - look at the value of 'n'

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• 15.

### What is the equation for the graph above? (x^2 is x squared)

y=1/3x^3
Explanation
Use your chart - match the shape - look at the value of 'n'
Then, use the app - pointequ - to plot the point and the value for 'n' - go to page 1.5 for your answer
If you wrote y=0.33x^3, you were close, but should have recognised it was 1/3

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• 16.