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Writing expressions from situations
Writing expressions from situations
Example 1
Each ticket costs $4. There is one booking fee of $3. Which expression gives the total cost for x tickets?
Show worked answer
Answer: 4x+3
- Ticket cost is 4×x; add the single booking fee 3.
Example 2
A number x is increased by 3, then the result is multiplied by 5. Which expression matches?
Show worked answer
Answer: 5(x+3)
- The first result is x+3. Multiply the whole result by 5, so brackets are needed.
Example 3
A rectangle has length x+2 and width 5. Its perimeter is 2x+k. Find k.
Show worked answer
Answer: 14
- P=2(x+2)+2×5=2x+14.
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