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I think you are asking about what I would call the slope-intercept method of graphing a straight line. (If not, please resubmit the question with more background)

If you have y = 2x - 3, then the slope is 2 and the y-intercept is -3. Start by marking the y-intercept at -3 on the y-axis. Next, think of the slope as a fraction: 2 = 2/1 = rise/run.

Starting at (0,-3), go up 2 squares and 1 to the right, arriving at (1,-1). Repeat, and get to (2,1) and so on.

To go the other way think of 2 as -2/-1. Start at (0,-3) again and "rise" -2 (go down 2), and go -1 to the right (1 to the left). This will take you to (-1,-5); again, repeat as often as you wish to find more points, then draw a straight line through them all.

If the points aren't all in a line, check your work!

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12y ago
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