Numihanax + y = 18. If x = 16, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: ________________
LEARN, PRINT & PRACTISE
Equations with two unknowns.
Equations with two unknowns
Numihana · England Year 6
Equations with two unknowns
Practice sheet
Name: ______________
Date: ______________
Equations with two unknowns
x + y = 16. If x = 14, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: ________________
x + y = 17. If x = 11, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: ________________
x + y = 4. If x = 0, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: ________________
x + y = 19. If x = 14, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: ________________
x + y = 11. If x = 9, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: ________________
Numihana · England Year 6
Equations with two unknowns
Answer key
Name: ______________
Date: ______________
Equations with two unknowns
x + y = 18. If x = 16, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: 2
x + y = 16. If x = 14, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: 2
x + y = 17. If x = 11, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: 6
x + y = 4. If x = 0, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: 4
x + y = 19. If x = 14, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: 5
x + y = 11. If x = 9, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: 2
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The skill behind this activity
Equations with two unknowns
Department for Education: mathematics programmes of study ↗
Year 6 → Algebra · Selected statutory skill. Pack 2.2.0 · source checked 2026-10-12.
For teachers and parents
Use the equality to find the missing partner for the given value. List further whole-number pairs systematically from zero upwards to show all possible solutions.
A common slip
An equation with two unknowns can have several pairs; the supplied value identifies one of them.
Worked example
x + y = 7. If x = 5, what is y? Afterwards list the other non-negative whole-number pairs.
Answer: 2
Use the equality to find the missing partner for the given value. List further whole-number pairs systematically from zero upwards to show all possible solutions.