Systems Elimination and Word Problems

The sum of two numbers is 24 and their difference is 2. What are the numbers?

Select the two answers below that define your variables.

• x = first number

• y = second number

• x = 24

• y = 2

Tags

CCSS.8.EE.C.8C

The sum of two numbers is 24 and their difference is 2. What are the numbers?

• The numbers are 11 and 13.

• The numbers are 24 and 2.

• The numbers are 2 and 22.

• The numbers are 10 and 24.

Tags

CCSS.8.EE.C.8C

The difference between two numbers is 9. The first number plus twice the other number is 27. Find the two numbers.

Select the two answers below that define your variables.

• x = first number

• y = second number

• x = 9

• y = 27

Tags

CCSS.8.EE.C.8C

The difference between two numbers is 9. The first number plus twice the other number is 27. Find the two numbers.

• The two numbers are 6 and 15.

• The two numbers are 9 and 27.

• The two numbers are 9 and 18.

• The two numbers are 6 and 21.

Tags

CCSS.8.EE.C.8C

Gabby and Sydney bought some pens and pencils. Gabby bought 4 pens and 5 pencils for $6.71. Sydney bought 5 pens and 3 pencils for $7.12. Find the cost of each.

Select the two choices below that define your variables.

• x = the cost of a pen

• y = the cost of a pencil

• x = 9 pens

• y = 8 pencils

Tags

CCSS.8.EE.C.8C

Gabby and Sydney bought some pens and pencils. Gabby bought 4 pens and 5 pencils for $6.71. Sydney bought 5 pens and 3 pencils for $7.12. Find the cost of each.

• The cost of a pen is $1.19 and the cost of a pencil is $0.39.

• The cost of a pencil is $1.19 and the cost of a pen is $0.39.

• The cost of a pen is $6.71 and the cost of a pencil is $7.12.

• The cost of a pen is $7.12 and the cost of a pencil is $6.71.

Tags

CCSS.8.EE.C.8C

Mary has a collection of nickels and quarters for a total value of $4.90. If she has 42 coins total, how many of each kind are there?

Select the two choices below that define your variables.

• x = number of quarters

• y = number of nickels

• x = 42 coins

• y = $4.90

Tags

CCSS.8.EE.C.8C

Mary has a collection of nickels and quarters for a total value of $4.90. If she has 42 coins total, how many of each kind are there?

• Mary has 28 nickels and 14 quarters.

• Mary has 14 nickels and 28 quarters.

• Mary has $4.90.

• Mary has 42 coins.

Tags

CCSS.8.EE.C.8C

Ms. Snow decides to give a test worth 90 points and contains 25 questions. Multiple-choice questions are worth 3 points each and word problems are worth 4 points each. How many of each type of question are there?

Select the two choices that define your variables.

• x = number of multiple choice questions

• y = number of word problems

• x = 90 points

• y = 25 questions

Tags

CCSS.8.EE.C.8C

Ms. Snow decides to give a test worth 90 points and contains 25 questions. Multiple-choice questions are worth 3 points each and word problems are worth 4 points each. How many of each type of question are there?

• There are 10 multiple-choice questions and 15 word problems.

• There are 15 multiple-choice questions and 10 word problems.

• The test is worth 90 points.

• There are 25 questions total on the test.

Tags

CCSS.8.EE.C.8C