Where is the main lesson?

Linear Relationships has the full topic, examples, and practice links.

Which calculator first?

After your setup is on paper, open Graph linear functions for a quick numeric pass.

Calculator for linear relationships: enter the expression or equation you already wrote.

Read Linear Relationships, then type what is on your paper. Parentheses and units are the usual sources of mismatch.

Change one input at a time. If the output jumps more than you expected, that input was doing more work in the expression than you thought.

Write 3(x + 2) on paper. Enter it with parentheses so the tool multiplies 3 by the whole sum, not only by x.

Written work
Tool output

Go deeper: Linear Relationships. Use the calculators below with your own loan or bill numbers, not only the examples on this page.

Where is the main lesson?: Linear Relationships has the full topic, examples, and practice links.
Which calculator first?: After your setup is on paper, open Graph linear functions for a quick numeric pass.