How do I find the slope of the line x – 4y = 8?

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M = Y2 - Y1 / X2 - X1 (slope formula)  Let's plug in some x variables, and figure out our y variables. Your line:   X - 4y = 8  x       y  8      0  0     -2  Let's use (0, -2) and (8, 0) in our slope formula.  M = 0 - (-2) / 8 - 0 m = 2 / 8 m = 1 / 4  Remember, slope is rise over run.  So, if you were to plot these coordinates as well, you should see your line go up 1, and over 4.

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