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SAT Math: Equation of a Line 2

1. A line in the xy-plane passes through (2,4) and (-3,-6). Which of the following points lie on the line?
2. The graph of a line in the xy-plane has a slope of 3 and contains the point (0,-5). The graph of a second line passes through point (0,-1) and (-1,0). If the two lines intersect at the point (a,b), what is the value of a-b?
3.
In the xy-plane, ABCD is a quadrilateral. What is the equation of the line \overline{BC}?
4. Matthew recorded the distance his toy car traveled each minute. The results are shown in the graph.


What does the slope represent?
5. A line in the xy-plane passes through the point (0,2.5) and has a slope of \dfrac{5}{2}. Which of the following points lie on the line?
6. The number of textbooks in 5 universities are shown in the graph below. If the total number of textbooks is 30,000, what is an appropriate label for the vertical axis of the graph?