The slope of a line is a measure of its steepness. Mathematically, slope is calculated as "rise over run" (change in y divided by change in x).

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a, (x-3/7)=2/3(3/2x-9/14), and c, 12.3x – 18 = 3(–6 + 4.1x).
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1/510
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regular polygon of 9 sides has 9 lines of symmetry
A (x,-y). When you reflect over the x-axis, the y becomes negative