Solve System of Equations by Addition or Substitution

Which method is most appropriate?

• Substitution

• Elimination

• Graphing

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which operation would allow elimination by either addition or subtraction? (check all that apply---take your time!)

• Double the bottom row

• Divide the top row by 2

• Multiply the bottom row by 4

• Multiply the top row by 4

• Multiply the top row by 2 and the bottom row by 4

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the solution to this system of equations?

• (4, -1)

• (-1, 4)

• (-4, 1)

• (-4, -1)

Tags

CCSS.8.EE.C.8B

Solve the system of equations.
x + 2y = -3
x - y = -12

• (-9, 3)

• (-7 ,5)

• (3, 15)

• (9, 6)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the solution to the following system:

^{y = 5x}

^{3x + y = 24}

• ^{(15, 3)}

• ^{(3, 5)}

• ^{(3, 15)}

• ^{(5, 3)}

Tags

CCSS.HSA.REI.C.7

What is the solution to the following system?

^{x - y = 6}

^{x = 11}

• (11, 5)

• (55, 5)

• (11, 11)

• (5, 55)

Tags

CCSS.HSA.REI.C.9

y = 2x + 1
3x + y = 16

• x = 3

• (2, 7)

• (3, 5)

• (3, 7)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which is the correct setup for substitution for the system?

• 6x+4(2y)=16

• 6(2y)+4y=16

• 6x+4y=2y

• 2y=6x+4y

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which of the following will NOT allow elimination by adding or subtracting?

• Multiply the top row by 26 and the bottom row by 13

• Multiply the top row by 13 and the bottom row by 11

• Multiply the top row by 2

• Multiply the top row by -39 and the bottom row by 12

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

ELIMINATOR QUESTION

Two groups of friends went to the movies.

The first group bought 3 sodas and 4 popcorns for $25.75

The second group bought 2 sodas and 3 popcorns for $18.75

What is the cost of ONE POPCORN? (HINT: x=soda, y=popcorn (a)   there is elimination)

Tags

CCSS.8.EE.C.8C