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Solve this simultaneous linear equation=X+y=4and2x-y=5​

1 Answer

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  • x+y=4---(1)
  • 2x-y=5---(2)

From eq(1)


\\ \sf\longmapsto x+y=4


\\ \sf\longmapsto x=4-y\dots(3)

  • Put values in eq(2)


\\ \sf\longmapsto 2x-y=5


\\ \sf\longmapsto 2(4-y)-y=5


\\ \sf\longmapsto 8-2y-y=5


\\ \sf\longmapsto 8-3y=5


\\ \sf\longmapsto 8-5=3y


\\ \sf\longmapsto 3y=3


\\ \sf\longmapsto y=(3)/(3)


\\ \sf\longmapsto y=1

Put value in eq(3)


\\ \sf\longmapsto x=4-y


\\ \sf\longmapsto x=4-1


\\ \sf\longmapsto x=3

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