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

2. The following equation has degree 4 because the highest power of the variable x is 4:
x^4 � 3 x^2 + 2 = 0.
Explain how one can use the quadratic formula to solve this equation by using a change of variable. Solve this equation completely. I am having trouble understanding how to distribute the negative number. Please explain.