Question

For solving pair of equation, in this exercise use the method of elimination by equating coefficients :
3x - y = 23
`x/3 + y/4 = 4`

Answer 1

3x - y = 23                         ...(1)

`x/3 + y/4 = 4`
4x + 3y = 48                     ...(2)

Multiplying equation no. (1) by 3
9x - 3y = 69                      ....(3)

Adding equation (3) and (2)       
           9x - 3y = 69 
     +   4x + 3y = 48       
                 13x = 117
                     x = 9

From (1)
3(9) - y = 23
∴ 27 - y = 23
∴  y = 27 - 23
∴  y = 4