Grade 9Mathpractice16 questions

Simultaneous equations

Grade 9: solve by substitution, solve by elimination, word problems.

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Free to play. Teams answer on one screen; your phone is the remote. No student devices.

Questions

  1. If y = 2x and x + y = 12, what is x?

    • 3
    • 4
    • 6
    • 8
    Show answer4

  2. If y = x + 3 and 2x + y = 15, what is y?

    • 6
    • 7
    • 8
    • 9
    Show answer7

  3. The equations x = 2y and x + y = 9 have the solution x = 6, y = 3. (True or false?)

    Show answerTrue

  4. Solve by substitution: x = 3y − 1 and 2x − y = 8. What is x? (Answer out loud)

    Show answer5

  5. If y = 5 − x and 3x − 2y = 5, what is x?

    • 2
    • 3
    • 4
    • 5
    Show answer3

  6. If x + y = 10 and x − y = 4, what is x?

    • 14
    • 3
    • 6
    • 7
    Show answer7

  7. If 2x + 3y = 12 and 2x − y = 4, what is x?

    • 2
    • 3
    • 4
    • 6
    Show answer3

  8. Adding 2x + 3y = 7 and 4x − 3y = 5 eliminates y and gives 6x = 12. (True or false?)

    Show answerTrue

  9. If 2x + 3y = 13 and 3x + 2y = 12, what is y? (Answer out loud)

    Show answer3

  10. To eliminate x from 2x + 3y = 8 and 5x − 4y = 7, multiply them by which numbers?

    • 2 and 5
    • 3 and 4
    • 4 and 3
    • 5 and 2
    Show answer5 and 2

  11. Two numbers add up to 25 and differ by 7. What is the larger number?

    • 15
    • 16
    • 18
    • 9
    Show answer16

  12. 3 pens and 2 notebooks cost 12 dollars. 1 pen and 2 notebooks cost 8. Notebook price?

    • 2 dollars
    • 3 dollars
    • 4 dollars
    • 5 dollars
    Show answer3 dollars

  13. 10 tickets cost 38 dollars; adults pay 5, children 3. The group has 5 adults. (True or false?)

    Show answerFalse

  14. A rectangle has perimeter 30 cm and its length is 3 cm more than its width. Width?

    • 5 cm
    • 6 cm
    • 7 cm
    • 9 cm
    Show answer6 cm

  15. Mia is twice as old as Leo. In 4 years their ages add up to 20. How old is Mia now? (Answer out loud)

    Show answer8

  16. 12 tokens are worth 2 or 5 points each, 36 points in total. How many 5-point tokens?

    • 3
    • 4
    • 6
    • 8
    Show answer4

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