book Maths Puzzle Numerical Ability

Ms. bell has money invested in two enterprises. She has $900 more invested at 8% than she does at 6% a year. She earned $170 of annual interest from teh investments. How much does

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|x-1|<3 The Graphs of ax+by=13 and ax-by=-3 instersect at (1,4). Find a and b.