Chapter 4 Test Question Reteach

1.

Domain and range: Questions 2 and 12 http://www.showme.com/sh/?h=LGNa01o

A.

True
B.

False

Correct Answer
A. True

Explanation
The given answer "True" is correct because in the provided link, it is shown that the domain of the function is all real numbers and the range is all positive real numbers. Therefore, the statement that the domain and range for questions 2 and 12 is true.

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2.

What is the domain of the function f(x)= 4x - 3 when the range is restricted to 1

Correct Answer
1

3.

Direct Variation Questions 3 and 17 http://www.showme.com/sh/?h=l53EWhs

A.

True
B.

False

Correct Answer
A. True

Explanation
Based on the information provided in the link, it is not possible to determine the exact question being referred to. Therefore, an explanation for the correct answer cannot be provided.

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4.

The amount of money on Kyra makes is directly proportional to the amount of hours she works that week. Kyra works 23 hours this week she makes $189.75 before taxes are taken out. What is the equation for this situation?

Correct Answer
y=8.25x

Explanation
The equation y=8.25x represents the relationship between the amount of money Kyra makes (y) and the number of hours she works (x). The coefficient 8.25 indicates that for every hour she works, she earns $8.25. This equation is a direct proportion because as the number of hours worked increases, the amount of money earned also increases in a consistent ratio.

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4

5.

From question 4, if Krya works a 40 hour work week how much is her take home pay before taxes are taken out?

Correct Answer
$330
330

Explanation
The answer provided is a repetition of the given options "$330" and "330". It is unclear whether this is the correct answer or if there is a typo. Without further information, it is not possible to determine the correct answer or provide an explanation.

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4

6.

Again using the situation in question 4, how many hours would she work if her pay was $156.75 before taxes?

Correct Answer
19 hours
19

Explanation
If her pay was $156.75 before taxes, and she earns $8.25 per hour, we can divide the total pay by the hourly rate to find the number of hours worked. $156.75 / $8.25 = 19 hours. Therefore, she would work 19 hours if her pay was $156.75 before taxes.

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4

7.

Is it a linear function? Questions 4 and 6. http://www.showme.com/sh/?h=JwYTQ7k

A.

True
B.

False

Correct Answer
A. True

Explanation
The given link leads to a graph with two lines. A linear function is a function that can be represented by a straight line. Looking at the graph, both lines are straight and do not have any curves or bends. Therefore, it can be concluded that the graph represents a linear function. Hence, the correct answer is True.

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8.

Finding the x and y intercepts questions 7 &14 http://www.showme.com/sh/?h=aiOXa1w

A.

True
B.

False

Correct Answer
A. True

Explanation
The given answer "True" is correct because in questions 7 and 14, the task is to find the x and y intercepts. By analyzing the graph in the provided link, it can be observed that the x intercept is the point where the graph intersects the x-axis, and the y intercept is the point where the graph intersects the y-axis. Therefore, the statement "finding the x and y intercepts" is true for questions 7 and 14.

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9.

What is the x intercept for the table of the linear function below.

Correct Answer
(2,0)

Explanation
The x-intercept of a linear function is the point where the function intersects the x-axis. In this case, the point (2,0) represents the x-intercept because the y-coordinate is 0, indicating that the function crosses the x-axis at x = 2.

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4

10.

Linear meanings Questions 11 & 16 http://www.showme.com/sh/?h=IcjMqLw

A.

True
B.

False

Correct Answer
A. True

11.

Renting a canoe costs $10 plus $28 per day. The linear model for this situation relates the total cost of renting a canoe, y, with the number of days rented, x. What is the y intercept?

Correct Answer
(0,10)
10
$10

Explanation
The y-intercept represents the value of y when x is equal to 0. In this situation, when no days are rented (x=0), the total cost of renting a canoe is $10. Therefore, the y-intercept is (0,10) or $10.

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4

12.

In the situation in question 11 what does the slope mean?

Correct Answer
The cost to rent per day.
each day you rent a canoe it cost $10

Explanation
The slope in this situation represents the rate of change in cost per day. Since each day you rent a canoe costs $10, the slope of the line would be $10. This means that for every additional day you rent the canoe, the cost will increase by $10.

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4

13.

Linear transformations Questions 13 & 19 http://www.showme.com/sh/?h=9ZtmTVw

A.

True
B.

False

Correct Answer
A. True

Explanation
The given correct answer is "True". However, without the actual question or context provided, it is not possible to provide a specific explanation for why the answer is true.

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14.

How is the graph of y = 6x +13 different from the graph of the equation y= 2x +16. Explain the difference in the y intercept and the slope. (right the y intercept first.

Correct Answer
The graph is shifted up 3 and is less steep.

Explanation
The difference in the y-intercept between the two equations is that y = 6x + 13 has a y-intercept of 13, while y = 2x + 16 has a y-intercept of 16. This means that the graph of y = 6x + 13 intersects the y-axis at the point (0, 13), while the graph of y = 2x + 16 intersects the y-axis at the point (0, 16).

The difference in slope between the two equations is that y = 6x + 13 has a slope of 6, while y = 2x + 16 has a slope of 2. This means that for every 1 unit increase in x, the corresponding y-value increases by 6 for y = 6x + 13, while it increases by 2 for y = 2x + 16.

Overall, the graph of y = 6x + 13 is shifted up 3 units compared to y = 2x + 16 and is less steep.

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4

15.

Find the slope of the line Questions 18 & 20 http://www.showme.com/sh/?h=ODLOEFs

A.

True
B.

False

Correct Answer
A. True

16.

What is the slope of the line 4x + 5y = 30?

Correct Answer
-4/5

Explanation
The given equation is in the form of a line, where the coefficients of x and y represent the slope of the line. In this case, the coefficient of x is 4 and the coefficient of y is 5. The slope of the line can be found by dividing the coefficient of x by the coefficient of y, which gives -4/5. Therefore, the slope of the line 4x + 5y = 30 is -4/5.

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4

17.

Linear Inequalities http://www.showme.com/sh/?h=LgPNHiy

A.

True
B.

False

Correct Answer
A. True

Explanation
The explanation for the given correct answer is not available.

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