alleryFind x and y. I: x + y = 10. II: x - y = 2.
AI alone suffices
BNeither, even together
CII alone suffices
DBoth together needed
Answer & Solution
Correct answer: D. Both together needed
Two independent equations in two unknowns give x = 6 and y = 4 only when used together.
Keep practising Data Sufficiency
Browse all Data Sufficiency questions for GMAT, or explore more Reasoning topics.
Related questions
Three distinct parallel planes in space have what solution set?Generally, with 5 unknowns and 3 independent equations, solution set dimension?Removing one independent equation does what to the solution set?What do independent equations each provide about the variables?An inconsistent linear system can always be rewritten as which statement?A linear system with no solution at all is called what?Generally, two independent equations in two unknowns give how many solutions?A system with fewer equations than unknowns is generally called what?