exam Maths Puzzle Numerical Ability

Is it possible to have 4 or 5 varables in algebra? if so how far can you go?

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exam Other Question

Show Algebraically that the ordered pairs (4,8)(1, 1,1 1/2) (2,3) are co linear (.44721359x^2+.559017)^2-x=0
or
4x^2-4(sqrt(5x))+5=0