Solving Systems of Linear Equations with Elimination Method

The video tutorial explains how to solve systems of equations using the elimination method, focusing on cases with unmatching coefficients. It provides a step-by-step guide to align variables, create common coefficients, and solve for variables. The tutorial includes six examples, demonstrating solutions with unique solutions, infinite solutions, and no solutions.

What is the first step in solving systems of equations by elimination when coefficients do not match?

• Subtract one equation from another

• Align the variables of the equations

• Add equations directly

• Multiply equations to align variables

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CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What should be done after aligning variables in the equations?

• Subtract the equations

• Multiply to create common coefficients

• Divide the equations

• None of the above

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CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

In the context of elimination, what does it mean to 'line up' variables?

• None of the above

• Ensure variables are on the same side and in the same order

• Place variables on opposite sides of the equation

• Align variables vertically for subtraction

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CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

In the example, what was multiplied by 2 to eliminate the y variable?

• The bottom equation

• The top equation

• Both equations

• None of the equations

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CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What happens when you add equations with opposite coefficients?

• Nothing happens

• The variables get multiplied

• The variables get eliminated

• The constants get eliminated

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CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the correct sequence of steps after creating common coefficients?

• None of the above

• Add or subtract equations, solve for one variable, substitute back

• Multiply equations, divide by the coefficient, solve for variables

• Substitute variables immediately, solve for coefficients

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CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

When solving for y in the example, what operation was performed after substituting x = 1?

• Multiplication by 3

• Subtraction of 1

• Division by 3

• Addition of 1

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CCSS.HSF.IF.A.2

What indicates that a system of equations might have infinite solutions?

• The equations simplify to zero equals zero

• None of the above

• The equations result in a false statement

• The equations contradict each other

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CCSS.8.EE.C.8B

How can you create opposite coefficients in an equation?

• Subtract the same number from both sides

• Divide one equation

• Multiply one equation by a negative number

• Add the same number to both sides

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CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the result when the system of equations has no solution?

• The equations contradict each other

• The equations result in a true statement

• The equations simplify to zero equals zero

• The equations result in an identity

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CCSS.8.EE.C.8B