alleryTo find exact values of two unknowns, how many related equations are needed?
AOne
BFour
CTwo
DThree
Answer & Solution
Correct answer: C. Two
1. One equation with two unknowns has endless solutions.
2. A second related equation narrows them to one pair.
3. So two related equations are needed.
_Source: Wikipedia, Elementary algebra, Linear equations with two variables_
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