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On comparing the ratios (a1)/(a2),(b1...

On comparing the ratios `(a_1)/(a_2),(b_1)/(b_2)` and `(c_1)/(c_2)` , and without drawing them, find out whether the lines representing the following pairs of linear equations intersect at a point, are parallel or coincide: `5x-4y+8=0;\ \ \ \ 7x+6y-9=0` (ii) `9x+3y+12=0;\ \ \ 18 x+6y+24=0` (iii) `6x-3y+10=0;\ \ \ 2x-y+9=0`

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