exam Maths Puzzle Numerical Ability

i have to sole it algebraically

2y=8-x
y-2x=-1

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The sum of n and three subtracted from twelve times n is the same as negative eleven plus the product of 2 and the difference of n and five. right triangle application problem, the diameter of a ferris wheel is 250 ft and the top of the wheel is 264 feet above the ground. Find the riders height above the ground when th