exam Maths Puzzle Numerical Ability

Solve.
26). Find the slope of a line parallel to the line passing through (-5, 6) and (2, 1).

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exam Other Question

Find K if the given system of equations has infinite no of solutions.
2x+ky=1+2y and kx+12y=3
(1)-4 (2)6 (3)Either (1) or (2) (4) none of these.

i have chosen (3). But theanswer givenis (2). How it could be..?? plz explain this...?? -4(2x-3) = -8x + 5