exam Maths Puzzle Numerical Ability

How do you do this system of equation:
3x+5y=56
y= 66-8y / 5

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If x is directly proportional to y and x = 3 when y = 8, what is the value of x when y = 2

I am not using a specific book. I am just practicing... Carla invested $28,000, part at 14% and part at 9%. If the total interest at the end of the year is $3,370, how much did she invest at 14%?