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The cost of 5 notebooks and 7 pens is Rs 290, while the cost of 7 notebooks and 5 pens is Rs 310.
Using elimination, find the cost of one notebook (in Rs).

Class 10Elimination MethodAlgebra — Systems of Equations
  • ARs 30
  • BRs 25
  • CRs 20
  • DRs 35

Step-by-Step Solution

Let notebook = , pen = . Add: so . Subtract first from second: so . Add: (and ).
Answer: A) Rs 30

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