Substitution Circuit Game
Evaluate an algebra circuit by substituting x and y and passing each result into the next formula.
Math puzzle challenges
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Instructions, device progress and accessibility
Select Easy, Normal, or Hard; choose a UTC Daily challenge or unlimited Practice. Solve every algebra problem, then press Check answer. Hints and Undo mark the round as assisted. Scores and completed challenges save locally on your device when available.
Local progress is checked when play begins.
How to play Substitution Circuit
Evaluate an algebra circuit by substituting x and y and passing each result into the next formula. Start with Easy and move toward Hard when confident. Enter exact answers, including negative values where needed. Use your keyboard or touch controls, and check the answer before requesting a hint.
Understand the mathematics
If x = 2 and y = 3, with A = 2x − y, B = 3A + y and C = B − x, then A = 1, B = 6 and C = 4.
Each practice puzzle generates a new set of algebra questions. The daily challenge is consistent for the same date and difficulty, allowing fair repeat practice.
Worked example
If x = 2 and y = 3, with A = 2x − y, B = 3A + y and C = B − x, then A = 1, B = 6 and C = 4.
Tips for accurate algebra
Calculate in the displayed A → B → C order. Write down intermediate results so a mistake does not propagate. Check negative values, follow order of operations, and verify the solution against the question.
Frequently asked questions
What is substitution in algebra?
Substitution replaces a variable with its given numeric value before evaluating the expression.
Does calculation order matter?
Yes. Each later stage depends on earlier stages, so evaluate A before B and B before C.