book Maths Puzzle Numerical Ability

what are linear equations?

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A jar of contains 3 red, 5 white, and 2 blue marbles.A marble is drawn.What is the probability that the marble is blue? the answer is....1/4, 1/45, 1/3, or none of these? thank you for the help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Solve by addition state if it is inconsistent or dependent
1/3x - 1/2y = 5/6

1/2x - 2/5y = 9/10

I don't know where to begin on this problem.