Digital SAT Systems and Inequalities Formula Sheet
Purpose of this Digital SAT resource
This formula sheet organizes systems and inequalities relationships used in Digital SAT Math. A formula is useful only when each symbol, condition, and unit is understood, so the page pairs memory cues with selection and verification steps.
Key ideas to understand
- Formula or rule: elimination.
- Formula or rule: substitution.
- Formula or rule: reverse an inequality when multiplying or dividing by a negative.
Step-by-step method
- Name the target quantity and known values with units.
- Choose a formula whose conditions match the problem.
- Substitute with parentheses and retain exact values when practical.
- Check sign, size, units, and the original conditions.
Worked application
For systems and inequalities, write the relationship before entering numbers. Explain why it applies, complete the calculation, and use substitution, estimation, or a graph to verify.
How to practice and review
Attempt the skill without notes, record confidence before checking, and write a correction that identifies the exact reason for every miss. Repeat the idea later with different numbers or wording. Exams.fit questions are original independent practice and do not reproduce College Board questions. Use Bluebook and College Board resources for the official testing experience.
Related Digital SAT guides
Complete Digital SAT guide · Reading and Writing syllabus · Math syllabus · Adaptive pattern · Registration guide
Official fact source: College Board. Reviewed August 2, 2026; recheck changing dates, fees, devices, and policies before acting.