A function f(x) is defined as followings...

A function f(x) is defined as followings : `f(x)={ax-b, x <= 1 3x,1 < x < 2 bx^2-a, x >= 1` Prove that if f(x) is continuous at x=1 but discontinuous at x =2. then the locus of the point (a,b) is a straight excluding the point where it cuts the line `y=3.`

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