This hour you will learn how to use a line’s slope and key points to write that line’s equation—in some ways, the reverse of the process you learned last hour—along with how to solve real-life problems about direct and inverse variation.

The graph of the equation *y* - 2*x* = 6 follows. When *x* = 0, *y* = 6, and when *y* = 0, *x* = -3. These two key points are the ordered pairs ...

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