Question

please tell me answer​

Answer 1

Question :

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

Answer :

We will use elimination method ,

• 2 × ( 2x + 3y = 9 )
• 4x + 6y = 9

Now subtract equation 1 from equation 2 ,

• 4x + 9y = 7
• 4x + 6y = 9
• - - -
• 3y = -2
• y = $\sf\dfrac{-2}{3}$

Now substitute the value of y in any one equation ,

• 2x + 3 × $\sf\dfrac{-2}{3}$ = 9
• 2x - 2 = 9
• 2x = 9 + 2
• 2x = 11
• x = $\sf\dfrac{11}{2}$