I recommend that you use also pencil and paper for these activities.
Remember the Wiris calculator, a website where you can work online to check all the results of equations and systems and also graph their solutions. I help a lot.
Note: If you can not see these activities or Wiris calculator, your computer may not have Java installed system. You can install here.
You have many more activities on these topics in Algebra page potatoes. You'll see how little by little you are able to solve almost everything!
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