x · y · grid = 1 unit · proportional ⇒ through (0, 0)

Proportional Relationships

CCSS 7.RP.A.2

y = kx

Equation

decimal—

fraction—

Parameters

Constant of proportionality k2

how much y grows for each 1 of x — the unit rate

Shift b0

keep b = 0 to stay proportional (through the origin)

What the graph tells you

Proportional?—

Constant of proportionality k—

Unit rate (at x = 1)—

Passes through origin (0, 0)?—

Ratio table — is y ÷ x constant?

x	y	y ÷ x