Create the required linear function an use it to answer the question.
-Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 780. Based on these two
Data points, create a linear equation for the function that describes how score varies as a function of
Time. Use this function to predict an average score for persons taking a 43-hour review course.
Round your answer to the tenths place.
A)664.7
B)676.2
C)672.0
D)686.0

Question

Quizplus · Accepted Answer

The linear function can be derived using the two points (30, 620) and (70, 780). The slope (m) is (780-620)/(70-30) = 160/40 = 4. The equation of the line is y = 4x + b. Using one of the points to find b, 620 = 4(30) + b, so b = 500. The equation is y = 4x + 500. For 43 hours, y = 4(43) + 500 = 672.0.

Create the Required Linear Function an Use It to Answer