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Grade 8 · EE

Graph Proportional Relationships and Compare to Linear

Proportional relationships graph as lines through the origin (y = kx). Slope equals the unit rate k.

Grade 8Common Core 8.EE.B.5EEVerified correct ✓

Worked examples

The table below shows a proportional relationship between pounds of apples (x) and total cost in dollars (y): (1, 4); (6, 24); (7, 28); (8, 32); (14, 56). What is the unit rate (the constant of proportionality k in y = kx)?
Answer: 4
The table below shows a proportional relationship between hours worked (x) and dollars earned (y): (2, 20); (4, 40); (5, 50); (8, 80); (14, 140). What is the unit rate (the constant of proportionality k in y = kx)?
Answer: 10

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Proportional RelationshipsRatio Tables and Equivalent Ratios

More Grade 8 topics

Identify and Approximate Irrational NumbersApproximate Irrational Numbers on a Number LineInteger Exponents — Properties and RulesSquare Roots and Cube Roots of Perfect PowersScientific Notation — Read, Write, and ComputeOperations with Scientific NotationSlope of a Line — Rise over RunSolve Multi-Step Linear Equations