Change · 13 of 13

A graph is a picture of pairs

Each dot is one true pair. The line is many pairs, shown at once.

Why this exists

A list works: 2 hours, 20 of pay. 3 hours, 30 of pay. 4 hours, 40 of pay. It is true, and it is tiring. Your eye can’t see the relationship without rereading.

A graph turns the list into a picture. Across is one amount. Up is the other. Every honest pair becomes a point.