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Consider the equation . A student needs a solution where and are both positive integers.
How many such solutions are there?

Class 9Solutions of a Linear EquationLinear Equations
  • A2
  • B0
  • C3
  • D1

Step-by-Step Solution

Need and divisible by 7. So must be a multiple of 7; gives 35=7(5), (valid). gives , not positive). Only (7,5): 1 solution.
Answer: D) 1

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