book Maths Puzzle Numerical Ability

Why might function notation be important? What are the reasons for function notation?

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Use the slope ne ponit formula to find the linear equation for a line has a slope of (-2,2) and passes through the point (2,4) i need help on two problems if its possible!...

5-(square root 3x)=1

4x=1(all in sqaure root)=3

thanx
Trish