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Different forms of the equation.  Slope intercept form
x intercept and zeros, not in 8th grade but in algebra

Constant proportionality same as slope, keep the word in front of them.
Call it slope and call it m

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Vocab:  Slope (start using that word in 7th grade to get them used to it by 8th. Highly tested)
y = mx + b 7th grade
y = mx + b 8th grade

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y = ax or y = x in 6th grade
Vocab: Constant of Proportionality, Linear Relationships