Equivalent Expressions on the Digital SAT: the Desmos Method
Two expressions are equivalent when they draw the exact same graph, so instead of expanding or factoring you graph the form you were given and read the missing number off the picture.
Advanced Math·65 practice problems in DesPrep
The Equivalent Expressions lesson is part of DesPrep
It is one of the 17 full lessons inside the subscription — 7 sections that take equivalent expressions from first principles to the fastest Desmos route, with a worked example on every one:
- Equivalent means the same picture
- The constant term lives on the y-axis
- Typing it without breaking it
- When the number you want is not on an axis
- Vertex form: p and q are the turning point
- Fractions that are really lines
- Same growth, different clock
Then 65 practice problems on this skill alone, solved inside a live Desmos calculator with step feedback and an expert replay on every one.