book Maths Puzzle Numerical Ability

Solve the following system of linear equations:

y=2x-8
y=3x-13

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book Other Question

this one i have no clue!!
two marbles are drawn without replacement from a box with 3 white, 2 green, 2 red, and 1 blue marble. find the probability that both marbles are white.
thanks, your a great help!! given that angle ABD=2y and angle DBC=6y-2, find angle DBC