System of Equations Different Strategies

Krista and Tywana were solving the system of equations below. They each shared what strategy they would use to solve the system. Who do you agree with? Is either student wrong? This is a placeholder for the diagram showing the system of equations and the strategies proposed by Krista and Tywana.

• Krista is correct, because she used the substitution method.

• Tywana is correct, because she used the elimination method.

• Both Krista and Tywana are correct, because they used two different methods.

• Neither one of them is correct.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the system of equations by using substitution. y = 2x + 3 y = x + 2 (x, y) = (_____, _____)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Parrish and Nadia's favorite store is having a sale. Parrish decides to purchase 3 new shirts and 3 pairs of pants for $120. Nadia purchases 2 new shirts and 3 pairs of pants for $105. This situation is modeled by the system of equations below, where s represents the cost of each shirt, and p represents the cost of each pair of pants. 3s + 3p = 120 2s + 3p = 105 How much does each shirt cost and each pair of pants cost?

• Each shirts costs $25 and each pair of pants costs $15

• Each shirts costs $15 and each pair of pants costs $25

• Each shirts costs $20 and each pair of pants cost $20

• Each shirts costs $20 and each pair of pants costs $15

Tags

CCSS.8.EE.C.8C

Consider the system of equations: 6x + 2y = 4 6x + 6y = 24 What could be the first step in solving the system of equations using elimination?

• Multiply the second equation by 3

• Multiply the first equation by -1

• Add the two equations

• Add 4 to both sides of the first equation

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Two linear equations with the same set of variables

• system of equations

• function

• association

• correlation

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Find the solution to the following pair of equations: 3x + 2y = 10 and 4x - y = 8

• x = 3, y = 5

• x = 1, y = 3

• x = 4, y = 6

• x = 2, y = 4

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Find the solution to the following pair of equations: 3x + 2y = 10 and 4x - y = 8

• x = 3, y = 5

• x = 1, y = 3

• x = 4, y = 6

• x = 2, y = 4

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

A customer at a store paid $64 for 3 large candles and 4 small candles. At the same store, a second customer paid $68 for 1 large candle and 8 small candles. The price of each large candle is the same, and the price of each small candle is the same. Which system of equations can be used to find the price in dollars of each large candle, x, and each small candle, y?

• 4y = 3x + 64

  8y = x + 68

• 4y = 3x + 64

  8y = x + 60

• 3x + 4y = 64

  x + 8y = 68

• 3x + 4y = 64

  x + 8y = 60

Tags

CCSS.HSA.CED.A.3

Name two strategies to solve system of equations

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which strategy is NOT be used to solve a system of equations?

• Graphing

• Elimination

• Worrying

• Substitution

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6