Alg 1 3.5 What is Going ON?

Alg 1 3.5 What is Going ON?

By Dianne Saevig

​Mrs. Saevig will explain (or review) how to find the LCM, using 16 and 24.

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1.) 4, 12

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2.) 6, 8

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3.) ​18, 9

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4.) 18, 27

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5.) 50, 40

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6.) ​​4, 10

Fill in the Blank

What is the LCM of 8 and 9?

Fill in the Blank

What is the LCM of 6 and 4?

Fill in the Blank

What is the LCM of 3 and 4?

Fill in the Blank

What is the LCM of 5 and 2?

Fill in the Blank

What is the LCM of 5 and 10?

Fill in the Blank

What is the LCM of 8 and 4?

Multiple Choice

Which variable is easiest to eliminate?

$$-7x-y=10$$  

$$6x+6y=-24$$  

• x's

• y's

Multiple Choice

What should we do to prepare the system for elimination?

$$-7x-y=10$$  

$$6x+6y=-24$$  

• multiply the first equation by 6

• multiply the first equation by -6

• multiply the second equation by 6

• multiply the second equation by 6

• none of these

Multiple Choice

Which variable is easiest to eliminate?

  $$2x-7y=-1$$  

  $$x+6y=-10$$  

• x's

• y's

Multiple Choice

What should we do to prepare the system for elimination?

  $$2x-7y=-1$$  

  $$x+6y=-10$$  

• multiply the first equation by 2

• multiply the first equation by -2

• multiply the second equation by 2

• multiply the second equation by -2

• none of these

Multiple Choice

Which variable is easiest to eliminate?

   $$-4x-3y=19$$  

   $$3x-6y=-6$$  

• x's

• y's

Multiple Choice

What should we do to prepare the system for elimination?

   $$-4x-3y=19$$  

   $$3x-6y=-6$$  

• multiply the first equation by 2

• multiply the first equation by -2

• multiply the second equation by 2

• multiply the second equation by -2

• none of these

Multiple Choice

Which variable is easiest to eliminate?

  $$9x+2y=-15$$    

    $$4x+2y=-10$$  

• x's

• y's

Multiple Select

What should we do to prepare the system for elimination?

  $$9x+2y=-15$$    

    $$4x+2y=-10$$  

• multiply the first equation by 4

• multiply the first equation by -1

• multiply the second equation by 4

• multiply the second equation by -1

• none of these

Multiple Choice

Which variable is easiest to eliminate?

  $$3x-4y=13$$  

  $$6x-6y=12$$  

• x's

• y's

Multiple Choice

What should we do to prepare the system for elimination?

  $$3x-4y=13$$  

  $$6x-6y=12$$  

• multiply the first equation by 2

• multiply the first equation by -2

• multiply the second equation by 2

• multiply the second equation by -2

• none of these

Multiple Choice

Which variable is easiest to eliminate?

$$9x-3y=0$$  

$$5x-4y=-14$$  

• x's

• y's

Multiple Choice

What should we do to prepare the system for elimination?

$$9x-3y=0$$  

$$5x-4y=-14$$  

• multiply the first equation by 4

• multiply the first equation by -4

• multiply the second equation by 4

• multiply the second equation by -4

• none of these

Multiple Choice

Which variable is easiest to eliminate?

$$7x-4y=4$$   

$$-4x+3y=-8$$  

• x's

• y's

Fill in the Blank

What should we multiply the first equation by?

$$7x-4y=4$$   

$$-4x+3y=-8$$  

Fill in the Blank

What should we multiply the second equation by if we multiplied the first equation by 3?

$$7x-4y=4$$   

$$-4x+3y=-8$$  

Multiple Choice

Which variable is easiest to eliminate?

  $$-6x+5y=20$$   

$$-4x-2y=24$$  

• x's

• y's

Fill in the Blank

What should we multiply the first equation by?

  $$-6x+5y=20$$   

$$-4x-2y=24$$  

Fill in the Blank

What should we multiply the second equation by if we multiplied the first equation by 2?

  $$-6x+5y=20$$   

$$-4x-2y=24$$  

Multiple Choice

Which variable is easiest to eliminate?

    $$-4x+2y=10$$   

$$-9x+7y=20$$  

• x's

• y's

Fill in the Blank

What should we multiply the first equation by?

   $$-4x+2y=10$$   

$$-9x+7y=20$$  

Fill in the Blank

What should we multiply the second equation by if we multiplied the first equation by 7?

   $$-4x+2y=10$$   

$$-9x+7y=20$$  

Multiple Choice

Which variable is easiest to eliminate?

$$-3x-7y=-13$$  

$$7x-8y=6$$  

• x's

• y's

Fill in the Blank

What should we multiply the first equation by?

  $$-3x-7y=-13$$  

$$7x-8y=6$$  

Fill in the Blank

What should we multiply the second equation by if we multiplied the first equation by 7?

  $$-3x-7y=-13$$  

$$7x-8y=6$$  

​This was practice with starting a problem. Now can you do one?