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Inverse of Linear Functions

Answers to pre-test
1(a) 
1(b) 
1(c) 
1(d) 
1(e)  x = 5
2(a) 

          Inverse is a function

2(b)

          Inverse is a function

2(c) 

        Inverse is a function

2(d) 

        Inverse is a function

2(e)  

        Inverse is not a function