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Linear equation-Wikipedia,the free encyclopedia
You can read all about Linear equation
Two-point form of equation:
y - y1 = [ ( y2 - y1 ) * ( x - x1 ) ] / ( x2 - x1 )
In this case:
x1 = 1
x2 = -3
y1 = 5
y2 = 1
y - 5 = [( 1 - 5 ) * ( x - 1 )] / [ ( -3 ) - 1 ) ]
y - 5 = ( -4 ) * ( x - 1 )/ ( -4 )
y -5 = ( - 4 / -4 ) * ( x - 1 )
y - 5 = 1 * ( x - 1 )
y - 5 = x - 1
y - x = -1 + 5
y - x = 4
Ax + By = C
A = 1
B = -1
C = 4
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