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  • Solve the following pair of linear equations :             3x – 5y = 4             2y + 7 = 9x

Solve the following pair of linear equations :

            3x – 5y = 4

            2y + 7 = 9x

 

 

 

 
 
 
 
 

Answers (1)

Given linear equations-

    \\3x - 5y = 4\\2y + 7 = 9x \ or \ 9x -2y = 7

So,

    \\3x - 5y = 4\quad -(i)\\9x -2y = 7\quad -(ii)

Multiply eq(i) by 3

    9x - 15y = 12\quad-(iii)

Subtract eq(iii) from (ii) we get

    13y = -5

    y=\frac{-5}{13}

Put the value of y in eq(i)

    3x - 5\left(\frac{-5}{13} \right ) = 4

    x = \frac{9}{13}

Posted by

Safeer PP

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