book Maths Puzzle Numerical Ability

A box contains 2 blue card numbered 1 thought 2, and three green cards numbered 1 through 3. List the sample space of picking a blue card followed by a green card.

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This question is actually about elimination because there werent any catorgories for elimination. My question is:
3x+4y=19
3x+6y=33

My answer was (7,-1/2) but I don't think th ways of demonstrating that a particular set of points is a square must work for all squares