Solving Systems of Equations: Elimination Method Insights

The video tutorial explains the elimination method for solving systems of equations. It covers various scenarios, including when equations have a single solution, no solution, or infinite solutions. The tutorial uses examples to demonstrate how to manipulate equations to eliminate variables and solve for unknowns. It also discusses the implications of parallel lines and overlapping lines in the context of solutions.

What is the goal when adding two equations together in a system of linear equations?

• To eliminate one of the variables

• To make the equations more complex

• To increase the number of variables

• To find the product of the variables

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In the first example, what do we multiply the top equation by to eliminate the y variable?

• 4

• 5

• 3

• 2

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What is the final solution for the first example after solving for x and y?

• (3, 2)

• (2, 3)

• (0, 0)

• (1, -1)

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CCSS.HSA.REI.C.6

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What does it mean when adding two equations results in 0 = 22?

• The system is dependent

• The system has infinite solutions

• The system has no solution

• The system has a unique solution

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CCSS.8.EE.C.8B

What can be inferred if two lines are parallel in a system of equations?

• They have infinite solutions

• They are the same line

• They intersect at one point

• They do not intersect

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What does it mean when adding two equations results in 0 = 0?

• The system has a unique solution

• The system has no solution

• The system has infinite solutions

• The system is inconsistent

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CCSS.8.EE.C.8B

What term describes a system of equations with infinite solutions?

• Inconsistent

• Dependent independent

• Consistent independent

• Consistent dependent

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In the final example, what is the lowest common multiple of 2 and 5 used to eliminate the x variable?

• 10

• 20

• 5

• 15

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What is the solution for the system of equations in the final example?

• (0, 0)

• (1, -1)

• (3, 2)

• (2, 3)

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What is the purpose of multiplying both equations by different values in the final example?

• To find the product of the variables

• To increase the number of variables

• To make the equations more complex

• To eliminate one of the variables

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CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6