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y−y1=m(x−x1)y - y_1 = m(x - x_1)y−y1=m(x−x1)
Gradient of the line
A point on the line
m=y2−y1x2−x1m = \frac{y_2 - y_1}{x_2 - x_1}m=x2−x1y2−y1
m1=m2m_1 = m_2m1=m2
m1×m2=−1m_1 \times m_2 = -1m1×m2=−1
Negative reciprocal: m2=−1m1m_2 = -\frac{1}{m_1}m2=−m11
y=mx+cy = mx + cy=mx+c
Same as original line's gradient
Negative reciprocal of original gradient
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