Grade 8 | Unit 5 | Lesson 9: Linear Models | Practice Problems

On the first day after the new moon, 2% of the Moon's surface is illuminated. On the second day, 6% is illuminated. Based on this information, predict the day on which the Moon’s surface is 50% illuminated and 100% illuminated. The Moon’s surface is 100% illuminated on day 14. Does this agree with the prediction you made? Is the percentage illumination of the Moon’s surface a linear function of the day?

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In science class, Jada uses a graduated cylinder with water in it to measure the volume of some marbles. After dropping in 4 marbles so they are all under water, the water in the cylinder is at a height of 10 milliliters. After dropping in 6 marbles so they are all under water, the water in the cylinder is at a height of 11 milliliters. What is the volume of 1 marble?

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In science class, Jada uses a graduated cylinder with water in it to measure the volume of some marbles. After dropping in 4 marbles so they are all under water, the water in the cylinder is at a height of 10 milliliters. After dropping in 6 marbles so they are all under water, the water in the cylinder is at a height of 11 milliliters. How much water was in the cylinder before any marbles were dropped in?

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In science class, Jada uses a graduated cylinder with water in it to measure the volume of some marbles. After dropping in 4 marbles so they are all under water, the water in the cylinder is at a height of 10 milliliters. After dropping in 6 marbles so they are all under water, the water in the cylinder is at a height of 11 milliliters. What should be the height of the water after 13 marbles are dropped in?

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In science class, Jada uses a graduated cylinder with water in it to measure the volume of some marbles. After dropping in 4 marbles so they are all under water, the water in the cylinder is at a height of 10 milliliters. After dropping in 6 marbles so they are all under water, the water in the cylinder is at a height of 11 milliliters. Is the relationship between volume of water and number of marbles a linear relationship? If so, what does the slope of a line representing this relationship mean? If not, explain your reasoning.

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For a certain city, the high temperatures (in degrees Celsius) are plotted against the number of days after the new year. Based on this information, is the high temperature in this city a linear function of the number of days after the new year?

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