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What is the equation of the line that contains the points (-3, 7) and (-5, 21)? y = 7x + 28 y = 7x - 14 y = -7x - 14 y = 7x - 28 What is the equation of the line with a slope of 2 that passes through the x-axis at -5? y = -2x - 10 y = 2x - 5 y = -2x - 5 y = 2x + 10 This table represents points that belong to a given line. What is the equation of the line that passes through the points on the table? x y y = 5x + 5 y = 10x + 5 y = 10x y = 5x + 25 15 2 25 4 6 35 45 8 A lawn service charges $25 per hour plus a one-time $30 fee for fertilizer. Which equation represents the total charge (y) for working (x) hours? y = 25x + 30 y = 30x + 25 y = 25(x + 30) y = 25(x + 5) What is the equation of the graphed function? y = -½ x + 2 y = ½ x - 2 y = -x + 2 y = x + 2 What is the slope of the line perpendicular to y = -½x + 4? -2 2 ½ -½ The equations represent parallel lines. The equations represent the same line. The equations represent perpendicular lines. The equations represent lines that intersect but are not perpendicular. Which statement is true about these equations?
y = -2x - 1 y = -2x + 5 Which equation best represents the line of best fit for this scatter plot? y = ½x - 4 y = ½x - 2 y = 2x - 2 y = 2x - 4 5,685 5,663 The table below shows the population of Coal County, Oklahoma. 2006 2000 2004 2002 2008 Year 6004 5929 5606 5721 5831 Pop. Paul determined the line of best fit is y = -44.5x + 5996, where x is the number of years since 2000 and y is the population. According to Paul's model, what is the best prediction for the population in 2007? 5,773 5,700 Pat's lower grades tend to follow weeks where she studies less. Getting higher grades will cause Pat to study less the week before the test. Pat will never study more than 4.5 hours. Pat's grades are going down. Pat recorded the scores she received on tests compared with the number of hours she studied on the week before the tests. 100 80 60 40 20 0 1 Study time (Hours) 2 3 4 5 What does the scatterplot imply about the relationship between her test score and the time she studied before the test? |