Question

For solving pair of equation, in this exercise use the method of elimination by equating coefficients :
13 + 2y = 9x
3y = 7x

 

Answer 1

13 + 2y = 9x                                  ...(1)
3y = 7x                                          ...(2)

Multiplying equation no. (1) by 3 and (2) by 2, we get,
          39 + 6y = 27x                     ...(1)
+                6y = 14x                     ...(2)
        -      -         -        
                   39 = 13x
                     x = 3

From (2)
3y = 7x
∴ 3y = 7(3)
∴ y = `21/3` = 7