exam Maths Puzzle Numerical Ability

Find the solution by substitution:
4x+3y=5
2x-y=-5

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exam Other Question

graph the function and determine the intervals if any on the real axis for which f(x) is greater than or equal to 0.
f(x)=x^2+1
thanks and i hope you can help What is the symmetries if any, of the equation x^2 + y^2=36