5 pens and 2 notebooks cost 34 dollars. 3 pens and 4 notebooks cost 40 dollars…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
pens and notebooks cost dollars. pens and notebooks cost dollars. Find the price of a pen and the price of a notebook.
Need a reminder? The key ideaShow
For a problem in words, name the two unknowns, write one equation for each fact, solve the pair, and check the answer in the words of the problem.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The pair. and .
Step 2. Make the notebooks match. Doubling the first: .
Step 3. Subtract. , so and dollars.
Step 4. The notebook. , so dollars.
Check in words. pens and notebooks: dollars. Yes.
Answer: a pen costs dollars and a notebook dollars.
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