Solving Systems by Elimination with Multiplication

What is the main goal of the lesson on solving systems by elimination with multiplication?

• To learn to add equations directly

• To learn to multiply one or both equations to get opposite coefficients

• To learn to divide equations

• To learn to subtract equations

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

In the first example, what is the least common multiple of the coefficients of the x terms (2 and 3)?

• 6

• 5

• 3

• 2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Why did the teacher choose to multiply the second equation by 2 in the first example?

• To simplify the equation

• To get opposite coefficients for y

• To get the same coefficients for x

• To eliminate the x variable

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

After multiplying the second equation by 2 in the first example, what is the new equation?

• 6x - 10y = -34

• 6x + 10y = -34

• 6x + 10y = -17

• 6x - 10y = -17

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

In the second example, what number is used to multiply the second equation to get opposite coefficients for x?

• 5

• 4

• 3

• 2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the y value of the ordered pair solution in the second example?

• 4

• 3

• 5

• 6

In the third example, what are the least common multiples of the coefficients of the x terms (3 and 5) and y terms (2 and 5)?

• 15 and 10

• 10 and 15

• 5 and 10

• 15 and 5

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the x value of the ordered pair solution in the third example?

• -4

• -3

• -5

• -2

Why is it recommended to substitute the found value back into one of the original equations rather than the multiplied ones?

• To simplify the process

• To check for errors

• To avoid dealing with larger numbers

• To ensure accuracy

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What should you do if you have any questions or concerns about the lesson?

• Ask a friend

• Ignore them

• Write them down and address them in class

• Search online

Tags

CCSS.RI.1.4

CCSS.RI.2.1

CCSS.RI.3.1

CCSS.RL.2.1

CCSS.RL.3.1