exam Maths Puzzle Numerical Ability

If y varies inversely as xsquared, and y=2 when x=4, what is the constant of variation?

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I have to write an equation of the line and express it in standard form. Can someone please show me how? Thanks!

Through (-3,5) and (5,3)? GIVEN f(x)=5x+7 AND g(x)=x^2+7, FIND (g o f)(x).