Download QUIZ Prep Classwork Direct Variations

Name_________________________________________________________
Chapter
Date __________
Quiz Prep Classwork
For use after Section 4.3
4
Graph the linear equation.
You can use the graph given or separate coordinate grids that we have available.
1
x
y = x -1
y = - -1
3
2
1.
xly
2.
xly
Find the slope of the line.
3.
4.
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Big Ideas Math Blue
Assessment Book
41
5.The cost y (in dollars) for x
pounds of deli meat is
represented by the
equation y = 2.5x. Graph the
equation and interpret the
slope.
6.The amount y (in cups) of flour is proportional to the
number x of eggs in a recipe. The recipe calls for 8 cups
of flour for every 2 eggs.
a. Write an equation that represents the situation.
b. Interpret the slope.
c. How many eggs are included when the recipe uses 16
cups of flour?
42
Big Ideas Math Red
Assessment Book
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7. The cost y (in dollars) to rent a lane at the
bowling alley is proportional
to the number x of hours that you rent the
lane. It costs $18 to rent the
lane for 2 hours.
a. Write an equation that represents the
situation.
b. Interpret the slope.
c. How much does it cost to rent the lane for
3 hours?
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Big Ideas Math Blue
Assessment Book
43
8. The gasoline y (in fluid ounces) is
proportional to the number of fluid
ounces of oil x used to run a 2-cycle
motor. It takes 45 fluid ounces of
gasoline for 9 fluid ounces of oil.
a) Write an equation that represents the
situation.
b) How much gasoline (in fluid ounces) is
needed for 15 fluid ounces of oil?
9. The number of pancakes y is
proportional to the cups of pancake mix
x that is used to make the pancake
batter. The pancake batter will make 20
pancakes when 5 cups of pancake mix is
used.
a) Write an equation that represents the
situation.
b) How many pancakes are made when 4 cups of
pancake mix are used in the pancake batter?
44
Big Ideas Math Red
Assessment Book
Copyright © Big Ideas Learning, LLC
All rights reserved.
10. The toll charge y (in dollars) is
proportional to the number of miles x
traveled on the interstate. It cost $8 to
travel 80 miles.
a) Write an equation that represents the
situation.
b) How much does the toll charge cost (in dollars) when
you travel 200 miles?
Tell whether x and y are in a proportional
relationship. Explain your reasoning. If
so, write an equation that represents the
relationship.
11.
12.
Copyright © Big Ideas Learning, LLC
All rights reserved.
Big Ideas Math Blue
Assessment Book
45