The rule
For graphs, the rule is the part that still works when you try new examples. Graphs puts it in context with practice.
Why it works
Example: multiplying both sides of a true equation by the same nonzero number gives another true equation, because every term was scaled by the same factor. The same “do it to both sides” logic carries over to graphs.
Small numbers
Try 2 + 3 = 5. Multiply both sides by 4: 8 + 12 = 20. Still true. That is the same idea as “do the same thing to both sides” when you solve.
Test it
The rule A quick test
Try values
Core lesson
Related: Graphs. Use the calculator with your own numbers when the example is not close to your case.
Use the calculator
FAQ
- Where is the main lesson?
Graphs has the full topic, examples, and practice links.
- Which calculator first?
After your setup is on paper, open Graphing calculator for a quick numeric pass.