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Mathematics

Solve the following systems of simultaneous linear equations by the elimination method

5x9=1y5x - 9 = \dfrac{1}{y}

x+1y=3x + \dfrac{1}{y} = 3

Linear Equations

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Answer

5x9=1y or 5x1y=95x - 9 = \dfrac{1}{y} \text{ or } 5x - \dfrac{1}{y} = 9 ……..(i)

x+1y=3x + \dfrac{1}{y} = 3 …….(ii)

Adding eq. (i) and (ii) we get,

5x1y+x+1y=9+36x=12x=2.\Rightarrow 5x - \dfrac{1}{y} + x + \dfrac{1}{y} = 9 + 3 \\[1em] \Rightarrow 6x = 12 \\[1em] \Rightarrow x = 2.

Substituting value of x in eq. (ii) we get,

x+1y=32+1y=31y=1y=1.\Rightarrow x + \dfrac{1}{y} = 3 \\[1em] \Rightarrow 2 + \dfrac{1}{y} = 3 \\[1em] \Rightarrow \dfrac{1}{y} = 1 \\[1em] \Rightarrow y = 1.

Hence, x = 2 and y = 1.

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