Write a Linear Model From a Scatter Plot

Use these after scatter plots and lines of best fit. Start with interpreting slope and intercept, then predictions, then writing models.

Write equations from two circled points for apple trees, swimmers, a candle and cricket chirps. The directions on the page read: Write the two circled points on each line. Use them to find its equation, and show your work. Then make the prediction and say what the slope and the y-intercept mean. An answer key is included.

Yes, both. We made it for 8th grade data & graphing, and it works the same at home or at school. At home, a student can work through it alone and then go over it with you, which shows quickly what is solid and what needs another look. In class it works as independent practice, homework or a warm-up, and you can print one copy or a full set.

It tells how much y changes for each one unit increase in x, in the units of the problem. For a model of maple trees, y = 1.5x + 3, each year adds about 1.5 feet of height.

When x is far outside the data or the answer is impossible in the situation, such as a score above 100. Use a Linear Model to Make Predictions asks students to circle yes or no for each prediction.

Pick two points on the line, find the slope from them, then solve for the y-intercept. Write a Linear Model From a Scatter Plot circles two points on each line to start.