Solving Systems by Elimination: Day 3 Insights

This video tutorial covers solving systems of equations using the elimination method. It begins with a review of the steps involved, followed by examples demonstrating the process. The video also provides shortcuts for simplifying the method and discusses special cases where systems have no solution or infinitely many solutions.

What is the first step in solving a system of equations by elimination?

• Line up the like terms vertically.

• Multiply the equations by a number.

• Solve for one variable.

• Add the equations together.

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CCSS.8.EE.C.8B

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If the x or y terms are not opposites, what should you do?

• Subtract the equations.

• Add the equations together.

• Divide one equation by the other.

• Multiply one or both equations by a number.

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CCSS.8.EE.C.8B

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In the example problem, what value of x is found after elimination?

• 8

• 2

• 4

• 6

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CCSS.8.EE.C.8B

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What is the final solution to the system in the first example problem?

• (4, 1)

• (3, 2)

• (2, 3)

• (1, 4)

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CCSS.8.EE.C.8B

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What is a shortcut for determining the multiplication factors?

• Multiply by the coefficient of the other equation.

• Multiply by the difference of the coefficients.

• Multiply by the coefficient of the same variable.

• Multiply by the sum of the coefficients.

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CCSS.8.EE.C.8B

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Why is it important to ensure the signs of the terms are opposite?

• To avoid errors in addition.

• To simplify the multiplication process.

• To ensure the terms cancel out.

• To make the equations easier to solve.

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CCSS.8.EE.C.8B

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In the second example problem, what is the value of y after solving?

• 1

• -1

• 0

• 2

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CCSS.7.EE.B.4A

What is the final solution to the system in the second example problem?

• (0, 1)

• (1, 0)

• (0, -1)

• (-1, 0)

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CCSS.8.EE.C.8B

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What does a true statement like 5 = 5 indicate in a system of equations?

• No solution

• One solution

• Inconsistent system

• Infinitely many solutions

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CCSS.8.EE.C.8B

What does a false statement like 4 = 0 indicate in a system of equations?

• Infinitely many solutions

• One solution

• Consistent system

• No solution

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CCSS.8.EE.C.8B