Page 186 - DMTH201_Basic Mathematics-1

Unit 6: Functions

Notes

Does this represent a function?

Yes, this represent a function because corresponding to each value of x & $ a is unique value
of y.
2
2
Now consider the equation x + y = 25
2
2
x + y = 25
x 0 0 3 3 4 4 5 5 3 3 4 4

y 5 5 4 4 3 3 0 0 4 4 3 3

Consider the function f(x) = 2x + 1. We know how to evaluate f at 3, f(3) = 2*3 + 1 = 7. In this section
it helps to think of f as transforming a 3 into a 7, and f transforms a 5 into an 11, etc.

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