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CBSE Class 10 Answered

Solve : 3x-5y=4 2y+7=9x
Asked by guptaabhinav0809 | 07 Mar, 2019, 06:18: PM
answered-by-expert Expert Answer
3x - 5y = 4  ....................(1)
9x - 2y = 7  ....................(2)
 
eqn.(1)×3 ,    9x - 15y = 12  .................(3)
eqn.(2)           9x - 2y   =  7   ..................(2)
 
by subtracting eqn.(2) from eqn.(3), we get ,   -13y = 5   or y = -5/13
 
by substituting y value in eqn.(1), we get x = 9/13
Answered by Thiyagarajan K | 07 Mar, 2019, 10:11: PM

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