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Question

Given two equations : 
3x4y=1 ---------- (1)
5x6y=7 ---------- (2)
What has to be done so that the coefficients of x are equal? 
  1. Multiply equation (1) by 6 and equation (2) by 4.
  2. Multiply equation (1) by 3 and equation (2) by 5.
  3. Multiply equation (1) by 5 and equation (2) by 3.
  4. None of the above


Solution

The correct option is C Multiply equation (1) by 5 and equation (2) by 3.
Coefficient of x in equation (1) is 3.
Coefficient of x in equation (2) is 5.
So, to make coefficients of x equal, multiply equation (1) by 5 and equation (2) by 3.
Equation (1)×515x20y=5
Equation (2)×315x18y=21
 

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