exam Maths Puzzle Numerical Ability

felix has 35 coins consisting of dimes and nickles. If the value of his coins is $3.30, then how many of each type does he have?

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how to find the "y"..??

x=-6

y=-2/3x+1 The distance between the base of the Leaning Tower of Pisa and the top of the tower is 180 feet. The tower is leaning 16 feet off the perpendicular. Find the distance of the top of the tower from the ground.