x
y
z
 
 
 
 
 
 =
17
1
1
34
2
17
51
3
−

 


 
−
−
=


 


 
−

 
Hence
x = 1, y = 2 and z = 3 Example 18 The sum of three numbers is 6 If we multiply third number by 3 and add
second number to it, we get 11 By adding first and third numbers, we get double of the
second number