AnswersTN-Algebra IWriting and Graphing Equations in Two Variables

Writing and Graphing Equations in Two Variables Answers

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Which description is represented by a discrete graph?

A
Kiley bought a platter for $19 and several matching bowls that were $8 each. What is the total cost before tax?
B
The temperature at 9 a.m. was 83° F and is heating up at an average rate of 6°F per hour. What is the temperature x hours later?
C
Juan ate an egg with 78 calories and some cereal with 110 calories per serving for breakfast. What is the total amount of calories he consumed?
D
A bottle contained 2,000 mL of liquid and is being poured out at an average rate of 300 mL per second. How much liquid is left in the bottle after x seconds?
2
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Julie needs to cut 4 pieces of yarn, each with the same length, and a piece of yarn 7.75 inches long. Let x represent the length of each of the equal pieces of yarn that Julie decides to cut. What is the equation that can be used to determine the total length of all of the yarn that she ends up cutting, y? Is the graph of the equation continuous or discrete?

A
y=7.75x+4; discrete
B
y=7.75x+4; continuous
C
y=4x+7.75; discrete
D
y=4x+7.75; continuous
3

Which graph represents viable values for y = 5.5x, where x is the number of cans of tomato paste and y is the total weight of the sealed cans in ounces?

A
On a coordinate plane, x-axis is numbered negative 5 to positive 5 in increments of 1, and the y-axis is numbered negative 27.5 to 27.5 in increments of 5.5. A straight line with a positive slope begins at point (0, 0) and ends at point (5, 27.5)
Option A
B
On a coordinate plane, x-axis is numbered negative 5 to positive 5 in increments of 1, and the y-axis is numbered negative 27.5 to 27.5 in increments of 5.5. Solid circles appear at points (0, 0), (1, 5.5), (2, 11), (3, 16.5), (4, 22), (5, 27.5)
Option B
C
On a coordinate plane, x-axis is numbered negative 5 to 5 in increments of 1, and the y-axis is numbered negative 27.5 to 27.5 in increments of 5.5. A straight line with a positive slope begins at point (negative 5, negative 27.5) and ends at point (5, 27.5).
Option C
D
On a coordinate plane, x-axis is numbered negative 5 to 5 in increments of 1, and the y-axis is numbered negative 27.5 to 27.5 in increments of 5.5. Solid circles appear at points (negative 5, negative 27.5), (negative 4, negative 22), negative 3, negative 16.5), (negative 2, negative 11), (negative 1, negative 5.5), (0, 0), (1, 5.5), (2, 11), (3, 16.5), (4, 22), (5, 27.5)
Option D
4

The graph shows the relationship between the number of minutes Maria spent jogging on a treadmill and the distance she jogged.

Question illustration
A
0.1 mile per minute
B
0.5 mile per minute
C
5 miles per minute
D
10 miles per minute
5

Otto used 5.5 cups of whole wheat flour and x cups of white flour in the recipe. What is the equation that can be used to find the value of y, the total amount of flour that Otto used in the recipe, and what are the constraints on the values of x and y?

A
y=5.5x; x is any integer greater than or equal to 0, and y is an integer greater than or equal to 5.
B
y=5.5x; x is any real number greater than or equal to 0, and y is any real number greater than or equal to 5.5.
C
y=x+5.5; x is any integer greater than or equal to 0, and y is an integer greater than or equal to 5.
D
y=x+5.5; x is any real number greater than or equal to 0, and y is any real number greater than or equal to 5.5.
6

The graph shows the relationship between the total cost and the number of gift cards that Raj bought for raffle prizes.

Question illustration
A
$80
B
$90
C
$100
D
$110
7

Vlad spent 20 minutes on his history homework and then completely solved x math problems that each took 2 minutes to complete. What is the equation that can be used to find the value of y, the total time that Vlad spent on his homework, and what are the constraints on the values of x and y?

A
y=2x+20; x is any integer greater than or equal to 0, and y is an integer greater than or equal to 20.
B
y=2x+20; x is any real number greater than or equal to 0, and y is any real number greater than or equal to 20.
C
y=20x+2; x is any integer greater than or equal to 0, and y is an integer greater than or equal to 20.
D
y=20x +2; x is any real number greater than or equal to 0, and y is any real number greater than or equal to 20.
8

Which graph represents viable values for y = 2x, where x is the number of pounds of rice scooped and purchased from a bulk bin at the grocery store and y is the total cost of the rice?

A
On a coordinate plane, a straight line with a positive slope begins at point (0, 0), and ends at point (2.5, 5).
Option A
B
On a coordinate plane, blue diamonds appear at points (0, 0), (1, 2), (2, 4).
Option B
C
On a coordinate plane, a straight line with a positive slope begins at point (negative 2.5, negative 5), crosses the x- and y-axis at point (0, 0), and ends at point (2.5, 5).
Option C
D
On a coordinate plane, blue diamonds appear at points (negative 2, negative 4), (negative 1, negative 2), (0, 0), (1, 2), (2, 4).
Option D
9

On a coordinate plane, a straight line with a positive slope begins at point (0, 50) and ends at point (5.5, 600).

Question illustration
A
the total amount of money in the cash register, y, containing $50 in change and small bills and x $100 bills
B
the total number of puzzle pieces, y, in a brand new 50-piece puzzle, and x brand-new 100-piece puzzles
C
the total weight of the barbell, y, where the bar weighs 50 pounds and x 100-pound weights are added to it
D
the total number of calories, y, in a salad with vegetables containing 50 calories topped with x ounces of salad dressing at 100 calories per ounce
10

Peaches are being sold for $2 per pound.The customer created a model to represent the total cost of peaches bought. If x represents the number of pounds of peaches bought and y represents the total cost of the peaches, which best describes the values of x and y?

A
The values of both x and y can be any real number.
B
The values of both x and y will be real numbers greater than or equal to 0.
C
The value of x and y will always be zero
D
The value of x can be any real number greater than or equal to 0, but the value of y must be an integer greater than or equal to 0.

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