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CBSE Class 10 Answered

49x-57y=172;57x-49y=252
Asked by kiranshinde1575 | 30 May, 2021, 06:51: PM
Expert Answer
49 x - 57 y = 172  ........................ (1)

57 x - 49 y = 252  .......................(2)
 
By adding eqn.(1) and (2) , we get 106 x - 106 y = 424  or x - y = 4  ..................(3)
 
By subtracting eqn.(1) from eqn.(2) , we get 8x + 8y = 80 or x + y = 10  ............(4)
 
By solving eqn.(3) and (4 ) , we get x = 7 , y = 3  
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