x–7

CC Algebra II Name _________________________ HW #4 Period ___Row ____Date ______ Linear Regression and Correlation Coefficient Read1.3 Example 4 Section 1.3 2.VOCABULARY A line of best fit has a correlation coefficient of −0.98. What can you conclude about the slope of the line? 11.ERROR ANALYSIS Describe and correct the error in interpreting the slope in the context of the situation. 17.MODELING WITH MATHEMATICS The data pairs (x,y) represent the average annual tuitiony(in dollars) for public colleges in the United Statesxyears after 2005. Use the linear regression feature on a graphing calculator to find an equation of the line of best fit. Estimate the average annual tuition in 2020. Interpret the slope andy-intercept in this situation.(See Example 4.) (0, 11,386), (1, 11,731), (2, 11,848) (3, 12,375), (4, 12,804), (5, 13,297) USING TOOLS In Exercises 19–24, use the linear regression feature on a graphing calculator to find an equation of the line of best fit for the data. Find and interpret the correlation coefficient. 19.23. 25.OPEN-ENDED Give two real-life quantities that have (a) a positive correlation, (b) a negative correlation, and (c) approximately no correlation. Explain.

CC Algebra II Name _________________________ HW #5 Period ___Row ____Date ______ Solving Linear Systems:Two Variables (From the Algebra 1 textbook) Solve the system of linear equations in two variables by the indicated method. 1.By graphing2.By substitution3.By elimination 23 1 xy2y+ 2x= −42x− 3y= −5 y=x− 2y+x= −55x+ 2y= 16 Section 1.3(From our Algebra 2 textbook) Solve the system of linear equations in two variables by elimination or substitution. 33.3x+y= 735.2x+ 2y= 3 −2x−y= 9x= 4y− 1 37.+ 4y= 438.y=x− 4 2x–y= 14x+y= 26

CC Algebra II Name _________________________ HW #6 Period ___Row ____Date ______ Solving Linear Systems:Three Variables Read1.4 Examples 1-4 Section 1.4

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