standard form of a linear equation
Y2-Y1 divided by X2-X1
(X2+X1divided by 2, Y2+Y1 divided by 2)
The Square root of (X2-X1)squared + (Y2-Y1)squared
Y-Y1= M( X-X1)
slope is the same.
opposite of the reciprocal
X= a number
Y= a number
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