exam Maths Puzzle Numerical Ability

#69 Find the interest on a $5000 bond that pays an annual percent rate of 61/2% for 6 years.

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ok for the top of question 23 in chap 7 on pg 494 i left the 6x2 as is. for the bottom part i foiled it out. orignal: x2+2x-35 so i (x+7)(x-5)then there is the division sign then f Please help solve:
-2x+3y=-2
y=3x-3