exam Maths Puzzle Numerical Ability

3x+y=7
-4x-y=7

If they say solver for x and y, What are the steps inorder to solve for x and y?

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exam Other Question

I have a question that states: find all real zeros of the function:
a)f(x)=-7x^4+343x^2
b)f(x)=x^4-16x^2+15

I have no idea how to do these when was queen elisabeth born in