Flash cards are one of the most effective ways to make sure students aren't "hiding" in your class. Here are 32 cards (eight per page) on finding the slope of a line from a graph or finding the entire equation of the line from the graph. Both answers are given separately on the back.
The backs are spaced perfectly with flipped spacing and answers to allow you to print them front to back. The first 24 cards have answers for lines with y=mx+b equations. The last eight include horizontal and vertical slopes and equations. If you don't need those just use the first 24.
Try running off a set for each pair of students in you class, cut them and bag them. Then ask students to "flash" each other. Or meet students at the door at the beginning of the period, make them answer one or two just to get into the room (Have a warm-up waiting for the students who make it inside). Use these at tutoring, or in the middle of longer periods to break up the time. You could even just run off one set to show under the document camera. Or run them one sided to create a card sort. Great for review or centers rotations. Especially good for home schooling or remediation. The possiblities go on and on.
Key words: slope-intercept, y=mx+b, flash cards, linear equations and their graphs, graphing linear equations, graphing from slope and y-intercept, task cards, scoot.