AnswersRecovery Content Sec Math 1 - Quarter 3 - 202627Solving Systems of Linear Equations: Linear Combinations

Solving Systems of Linear Equations: Linear Combinations Answers

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A small fruit basket with 6 apples and 6 oranges costs $7.50. A different fruit basket with 10 apples and 5 oranges costs $8.75. If x is the cost of one apple and y is the cost of one orange, the system of equations below can be used to determine the cost of one apple and one orange.6x+6y=7.5010x+5y=8.75

A
0.25
B
0.5
C
0.75
D
1.00
2
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The system of equations is solved using the linear combination method.What does 0 = −12 mean regarding the solution to the system?

Question illustration
A
There are no solutions to the system because the equations represent parallel lines.
B
There are no solutions to the system because the equations represent the same line.
C
There are infinitely many solutions to the system because the equations represent parallel lines.
D
There are infinitely many solutions to the system because the equations represent the same line.
3

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.
4

How many solutions are there to the system of equations?

Question illustration
A
no solutions
B
one solution
C
two solutions
D
an infinite number of solutions
5

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.
6

The system of equations below has no solution.

Question illustration
A
Four-thirds x = 42
Option A
B
Option
Option B
C
Fifteen-halves y = 33
Option C
D
0 = 0
Option D
7

Which statement is true about the equations –3x + 4y = 12 and x – y = 1?

Question illustration
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.
8

The system of equations shown is solved using the linear combination methodWhat does 0 = 0 mean regarding the solution to the system?

Question illustration
A
There are no solutions to the system because the equations represent parallel lines.
B
There are no solutions to the system because the equations represent the same line.
C
There are infinitely many solutions to the system because the equations represent parallel lines.
D
There are infinitely many solutions to the system because the equations represent the same line.
9

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.
10

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)

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