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(1) Form the pair of linear equations in the, following problems, and find their solutions, graphically., , (i) 10 students of class X took part in a, mathematics quiz. If the number of girls is 4, more than the number of boys, find the, number of boys and girls who took part in the, , quiz. aoe., (ii) 5 pencils and 7 pens together cost $50,, , whereas 7 pencils and 5 pens together cost, $46. Find the cost of one pencil and that of, , (2) On comparing the ratios a,/a,, b,/b2, C,/C,, find out whether the lines representing the, following pairs of linear equations intersect at, a point, are parallel or coincident., , (i) 5x -4y+8 = Oand7x+6y-9=0, (ii) 9x+3y+12 = Oand18x+6y+24 =0, , (iii) 6x-3y+10 = Oand2x-y+9 =0