In this activity, each student will be given a card with either: a point and a slope, an equation in point-slope form, an equation in slope-intercept form, or an equation in standard form. Students will walk around talking to one another to find the three cards that match up with theirs. This helps students relate all three forms and not see them as different and completely separate ideas.
This includes enough for two rounds and depending on the class, should be enough for a 10-15 minute activity. It works best with a class of 16 or 24, but it can be adjusted for different class sizes.
Note: When I teach standard form, I just focus on my students getting the x and y terms on one side together, which varies from most textbook definitions. You can either edit these to how you teach standard form or leave those cards out.