Using the numbers 1-9, and only each number once, find two points that make a line through the y-intercept shown below.

( ___, ___ ) and ( ___, ___ )

Equation formed:

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(2,3) and (4,5) Is this what you are after?

And your equation would be? Are there any other points that would create a different linear equation?

Once Students have a handle on that, really focus on the points that create unique linear equations. Then you start moving the y-intercept, 5 is a good one for exploring a few different options.