Understanding Functions and Linear Equations
Functions and equations form the foundation of algebraic thinking. A linear function represents a straight-line relationship between input and output values. When working with linear functions, we focus on creating equations, building function tables, and graphing relationships.
Understanding how to write equations from function tables requires careful analysis of the relationship between inputs x and outputs y. For example, when given a set of ordered pairs like 1,12, 2,24, and 3,36, we can determine that each output is 12 times the input, giving us the equation y=12x.
Definition: A linear function is a mathematical relationship where the graph forms a straight line, with a constant rate of change between input and output values.
When graphing linear functions like y=x+2, we follow a systematic approach. First, create a function table by choosing x-values and calculating corresponding y-values. Then plot these ordered pairs and connect them with a straight line. This visual representation helps us understand the relationship between variables.
Example: To graph y=x+2:
- Create ordered pairs: 0,2, 1,3, 2,4
- Plot points on coordinate plane
- Connect points with straight line