AnswersTN-Algebra I A SC 26-27 Elective FocusSolving Systems of Linear Equations: Substitution

Solving Systems of Linear Equations: Linear Combinations Answers

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1
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How many solutions are there to the system of equations?

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A
no solutions
B
one solution
C
two solutions
D
an infinite number of solutions
2
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Which statement is true about the equations –3x + 4y = 12 and x – y = 1?

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A
The system of the equations has exactly one solution at (–8, 3).
B
The system of the equations has exactly one solution at (–4, 3).
C
The system of the equations has no solution; the two lines are parallel.
D
The system of the equations has an infinite number of solutions represented by either equation.
3

The linear combination method is applied to a system of equations as shown.4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18

Question illustration
A
(1,2)
B
(3,9)
C
(5,5)
D
(9,3)
4

A personal trainer designs exercise plans based on a combination of strength-training and aerobic exercise. A beginner plan has 15 minutes per session of strength-training and 20 minutes per session of aerobic exercise for a total of 90 minutes of exercise in a week. An advanced plan has 20 minutes per session of strength-training and 30 minutes of aerobic exercise for a total of 130 minutes of exercise in a week.

A
Each plan utilizes a combination of 2 strength-training sessions and 2 aerobic exercise sessions per week.
B
Each plan utilizes a combination of 2 strength-training sessions and 3 aerobic exercise sessions per week.
C
Each plan utilizes a combination of 3 strength-training sessions and 2 aerobic exercise sessions per week.
D
Each plan utilizes a combination of 3 strength-training sessions and 3 aerobic exercise sessions per week.
5

Which ordered pair is a solution to the system of linear equations?2x + 3y= 6–3x + 5y = 10

A
(0,2)
B
(2,0)
C
(3,2)
D
(2,3)
6

Karina uses the system of equations below to compare the monthly utility costs in July and December for electricity, x, and natural gas, y. 750x + 17y = 141.61300x + 30y = 75.90

A
The cost of natural gas is $0.17 per unit.
B
The cost of natural gas is $0.20 per unit.
C
The cost of natural gas is $0.72 per unit.
D
The cost of natural gas is $0.83 per unit.
7

Which statement describes the graph of the system of equations below?1.5x + 0.2y = 2.681.6x + 0.3y = 2.98

A
The lines are parallel.
B
The lines overlap at all points.
C
The lines intersect at (1.6,1.4).
D
The lines intersect at (3.1,0.5).
8

Melinda and Paula shovel driveways and sidewalks in the winter as a way to earn extra money. Together they shoveled 450 square feet of sidewalk in 30 minutes. Then Melinda shoveled for 20 minutes while Paula shoveled for 25 minutes to complete 345 square feet of driveway.30x + 30y = 45020x + 25y = 345

A
3 square feet per minute
B
6 square feet per minute
C
9 square feet per minute
D
15 square feet per minute
9

To eliminate the y-terms and solve for x in the fewest steps, by which constants should the equations be multiplied by before adding the equations together?First Equation: 5x − 4y = 28Second equation: 3x - 9y = 30

A
The first equation should be multiplied by 3 and the second equation by 5.
B
The first equation should be multiplied by 3 and the second equation by −5.
C
The first equation should be multiplied by 9 and the second equation by 4.
D
The first equation should be multiplied by 9 and the second equation by −4.

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