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2015-06-22T12:04:10+05:30

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To have infinite number of solutions the ratio of corresponding coefficients should be same in both the equation , so that there is actually only one equation.

So
 \frac{2}{4} = \frac{a-4}{a-1} = \frac{2b-1}{5b-1}

Solving the above relation we get 
a=7
b=-1
2 4 2