9.3 Chapter Review, Questions: 7 and 8
7. Klaus works after school.
The graph shows his rate of pay.
a) Make a table of
values from the graph
b) Does the graph represent a linear relation? Explain.
c) Is it possible to have
other points between
the ones on this graph?
Explain.
Answers
a)
c) Yes, because time (h) has minutes and pay ($) has cents,
so when you put points in between it will still be okay.
8. The graph shows a linear relation.
a) Describe what the graph is about.b) Describe patterns on the graph.
c) What is the cost of 1 car wash?
d) Make a table of values from the graph.
e) If 15 cars are washed what is the income for the grade 8 class
Answers
a) The graph is about a Grade 8 car wash and how many income they will get per car.
b) The x axis goes up by 1. The y axis goes up by 10. It is a linear relation. Over 1, up 10
c) The cost of 1 car wash is $10.
d)
e) The income would be $150 because 10x = y
9.3 Chapter Test, Questions: 9 and 10
9. The pattern can be represented by the formula b = 4f where b is the number of black dots and f is the figure number.
a) Make a table of values for the number of black dots in figures 1 to 5
b) Use the formula to determine the number of black dots in figure 60.
Answers
a)
60f = b Fig. 60 = ? black dots
60(4) = b 60x4 = ? black dots
240 240 black dots
10. The formula for the pattern below is s = 2f + 1, where s is the number of small square and f is the figure number
b) Draw a graph to show a relationship.
c) Is the relationship linear? Explain.
Answers
a)
c) Yes because the ordered pairs are in a straight line and because the x and the y axis are going at a consecutive value of numbers, x axis is going up by 1's and the y axis going up by 2's, even though it starts at 3 it's still okay as long as pattern is the same.
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