Identifying Functions in TEKS 8.5G

The video tutorial explains how to identify functions using various methods such as ordered pairs, tables, graphs, and mapping diagrams. It emphasizes that for a relation to be a function, each x-value must correspond to only one y-value. The tutorial covers the vertical line test for graphs and demonstrates how to use mapping diagrams to determine if a relation is a function.

What is a key characteristic of a function when considering ordered pairs?

• Each y-value must be unique.

• Each x-value must map to a single y-value.

• Ordered pairs can repeat.

• Each x-value can map to multiple y-values.

Tags

CCSS.8.F.A.1

Can y-values repeat in a function?

• Yes, but only in tables

• No, y-values must be unique

• Yes, y-values can repeat

• No, unless the function is linear

Tags

CCSS.8.F.A.1

In a table representing a function, what is not allowed?

• Repeating y-values

• Positive y-values

• Repeating x-values

• Negative x-values

What does the vertical line test determine?

• If a graph represents a function based on y-values

• If a line is horizontal or vertical

• If a graph represents a function based on x-values

• If a graph can have repeating x-values

What is incorrect about mapping diagrams in functions?

• Arrows in mapping diagrams can only point from y to x

• Each x-value can map to more than one y-value

• Each x-value must map to exactly two y-values

• Mapping diagrams cannot be used to identify functions

Tags

CCSS.8.F.A.1