MAC 1105 Lecture 5: Chapter 2: Section 1 – Basics of Functions and their Graphs

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Chapter 2 section 1 basics of functions and their. Graphs: look at the definition of a function, determine if a set of points, an equation, and a graph is or is not a function. In this example, we have a set of 4 points. What is a function? function: a function is like a formula. Sometimes, it"s called a mapping from one set to another: it"s a relationship between two sets of things, for every x-value, there can only be one y output value. Here is a diagram that demonstrates this. x-values y-values. We can see that 1 corresponds to 2, 3 to 4, 5 to 6 and 8. In this set, we have 5 mapping to both 6 and 8. Determine if y is a function of x: x2 + y = 4. You would end up with the equation y = this simplifies to y = + and -given these results, y is not a function of x.

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