System model in context
Systems of linear equations · Stage 3
Recognize the pattern
Translate each total into an equation before solving.
Useful ruleTwo quantities, two constraints
Build on: ALG-09
Try it before reading the solution
Adult tickets cost $8, student tickets $5. Ten tickets total $65. How many adult tickets?
This teaching example is original and is not an official SAT question.
Reasoning
Let a + s = 10 and 8a + 5s = 65. Substitute s = 10 − a: 3a = 15.
Answer5 adult tickets
03 · Next step
See membership →Ready for adaptive practice
Practice questions remain in English, as on the SAT.