Grade 8 Science -- Released Test Questions - Data & Graphs - Free Printable

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- The graph shows a linear relationship between temperature and chirps per minute for crickets.
- At 10°C, the cricket chirps 40 times per minute.
- At 25°C, the cricket chirps 140 times per minute.
- The rate of change (slope) is (140 - 40) / (25 - 10) = 100 / 15 = 20/3 ≈ 6.67 chirps per minute per °C.
- The equation of the line is: Chirps = (20/3)(Temperature - 10) + 40.
- To find chirps at any temperature between 10°C and 25°C, substitute the temperature into the equation.
- For example, at 20°C: Chirps = (20/3)(20 - 10) + 40 = (20/3)(10) + 40 = 200/3 + 40 ≈ 66.67 + 40 = 106.67 chirps per minute.

Parent Tip: Review the logic above to help your child master the concept of graph examples for middle school science.

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