exam Maths Puzzle Numerical Ability

4x+5y=5
8x+10y=10
I need to solve this using elimination
* I know I need to solve for x and use that answer in the next equation, but not sure what one I have to start with. Your help is appreciated.

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exam Other Question

Think of a real-life situation that can be represented by a exponential function; translate the situation to the function and solve the function and represent it graphically? There is a pool of water. One Pipe empties the pool in 45 minutes. The other pipe empties it in 67.5 minutes. How long would it take to empty the pool if both pipes were used together?

This is from a worksheet my son brought home.