First, we find the slope of the line ax + by = c. To do this, we can rewrite the equation in the slope-intercept form, y = mx + b, where m is the slope.
ax + by = c
by = -ax + c
y = -\frac{a}{b}x + \frac{c}{b}
So, the slope of the line is m = -\frac{a}{b}.
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