WHY CAN'T ANYONE HELP ME? In 2001 there were 6680 electric-powered vehicles in use in the United States. In 1998 only 4760 electric vehicles were being used. Assume that the relationship between time, x, and number of electric-powered vehicles, y, is linear. Write an equation in slope-intercept form describing this relationship. Use ordered pairs of the form (years past 1998, number of vehicles).

  y = 640x +4760

Step-by-step explanation:

Given:

  (x, y) = (years past 1998, number of vehicles) = (0, 4760), (3, 6680)

Find:

  a slope-intercept form linear equation through these points

Solution:

The 2-point form of the equation of a line is a useful place to start:

  y = (y2 -y1)/(x2 -x1)(x -x1) +y1

  y = (6680 -4760)/(3 -0)(x -0) +4760

  y = 1920/3x +4760

  y = 640x +4760 . . . . . the desired equation

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