Let [.] denote the greatest integer function . if x and y satisfying the equation : y=3[x]+1, and y=2[x-1]+1 Simultaneously , then [x+y] equals

Answers (1)

Solution;    y=3[x]+1   ......(1)

                   y=2[x-1]+1     .......(2)

             Sloving (1) and (2) , we have

                  3[x]+1=2[x-1]+1

                3[x]+1=2[x]-2      .......(3)

    Rightarrow       [x]=-3    ,  y=3(-3)+1=-8

               [x+y]=[x-8]=-11

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