exam Maths Puzzle Numerical Ability

In the period of a year, an investor lost twice as much as he gained. If he originally had $10,000 and now has $8000, what amount did he gain and what did he lose?

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i need help solving the equations and checking your solution
4/3x-6/x=-4
The point (2, -5) is a solution to which of the following equations?
y = -3x + 1

y = -3x - 5

y = -3x - 3

y = -3x + 5