GRE Quant · Chapter Test
Linear Equations — 25-Question Test
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Formula Reference Sheet
This chapter
The balance rules
| Add / subtract | a = b ⇒ a ± c = b ± c |
|---|---|
| Multiply / divide (c ≠ 0) | a = b ⇒ a·c = b·c and a/c = b/c |
| Standard form | ax + b = 0 ⇒ x = −b / a |
| Clear fractions | multiply every term by the LCD |
Literal (formula) rearranging
| Solve ax + b = c for x | x = (c − b) / a |
|---|---|
| Solve for a variable in a product | divide both sides by its coefficient |
| Cross-multiply a/b = c/d | ad = bc |
GRE reference
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