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8th Grade Identifying Functions Worksheets

8th Grade Identifying Functions: decide whether tables, graphs and equations show functions and which are linear. Every worksheet is free, prints as a PDF with an answer key, and can be assigned online. The ones teachers open most are first.

← All 8th grade topics 8.F.1 8.F.3

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8th Grade Identifying Functions Worksheets - Identifying Functions (Tables) worksheet

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Identifying Functions (Tables)

8f1

Student objectives

Decide whether an input-output table is a function by checking if each input has exactly one output.
Spot when a table is not a function because the same input is paired with different outputs.

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8th Grade Identifying Functions Worksheets - Identify Linear Functions (Equations) worksheet

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Identify Linear Functions (Equations)

8f3

Student objectives

Decide whether an equation makes a straight-line relationship (a linear function) or not.
Recognize common linear forms like y = mx + b, point-slope form, and standard form.
Spot equations that are not linear because they have exponents, roots, variables multiplied together, or variables in the denominator.

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8th Grade Identifying Functions Worksheets - Identify Functions (Graphs) worksheet

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Identify Functions (Graphs)

8f1

Student objectives

Decide whether a graph represents a function by checking if each x-value matches only one y-value.
Use the vertical line test to spot graphs that are not functions.
Identify repeated x-values on a graph and explain why that breaks the function rule.

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8th Grade Identifying Functions Worksheets - Identify Linear Functions (Graphs) worksheet

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Identify Linear Functions (Graphs)

8f3

Student objectives

Decide whether a graph shows a linear function by checking if it makes a straight line.
Tell the difference between linear and non-linear graphs by looking for curves or changing steepness.

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8th Grade Identifying Functions Worksheets - Identify Functions (Equations) worksheet

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Identify Functions (Equations)

8f1

Student objectives

Decide whether an equation is a function by checking if each input has exactly one output.
Tell the difference between a function and a non-function when equations have x and y variables.

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8th Grade Identifying Functions Worksheets - Identifying Tables from a Function worksheet

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Identifying Tables from a Function

8f1

Student objectives

Practice matching a function equation to the correct table of x and y values
Plug x values into a given equation to check if the y values in each table are correct
Work with different types of functions including addition, multiplication, and combinations of both

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8th Grade Identifying Functions Worksheets - Identify Linear Functions (Table) worksheet

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Identify Linear Functions (Table)

8f3

Student objectives

Decide whether a table of input and output values follows a linear rule.
Check if the output changes by a constant amount when the input increases by the same amount.
Find the rate of change (slope) from a table by comparing how much the output changes to how much the input changes.
Spot tables that are not linear because the differences in the outputs are not consistent.

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8th Grade Identifying Functions Worksheets - Identifying Points of a Function in a Graph worksheet

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Identifying Points of a Function in a Graph

8f1

Student objectives

Decide whether a given point could be on the same function shown in a graph.
Connect a point on a graph to an input-output pair for the function.

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8th Grade Identifying Functions Worksheets - Identifying Points of a Function in a Table worksheet

Load up one problem at a time! Ideal for projectors, tablets and computers.

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Identifying Points of a Function in a Table

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Student objectives

Decide whether a given point could belong to the same function shown in the table.

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More 8th grade topics

Square Roots & Irrational Numbers 16 Transformations 5 Scientific Notation 7 Slope & Rate of Change 8 Comparing & Modeling Linear Functions 11 Laws of Exponents 3 Linear Equations & Systems 2 Pythagorean Theorem 2 Congruent & Similar Figures 5 Angles in Triangles 3 Volume of Cylinders, Cones & Spheres 2

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