exam Maths Puzzle Numerical Ability

3x-y=1
2x-3y=10

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Suppose you are copying a photograph and would like to reduce it to 75% of its original siz. The function y=.75^x models the size of an image x number of times after it is reduced. Graph the function. A bag contains two white marbles and one yellow marble. The marbles are randomly selected one at a time. What are the odds of picking the yellow marble on the first selection?