Posted by sue on Tuesday, September 13, 2011 at 12:25am.
The "point-slope" form of the equation of a straight line is:
y - y1 = m ( x - x1 )
(x1, y1) is a known point
m is the slope of the line
(x, y) is any other point on the line
In this case:
m = 5 / 3 , x1 = 57 , y1 = 12
y - 12 = ( 5 / 3 ) (x - 57 )
y = (5 x / 3 ) - ( 5 * 57 / 3 ) + 12
y = (5 x / 3 ) - ( 285 / 3 ) + 12
y = (5 x / 3 ) - 95 + 12
y = (5 x / 3 ) - 83
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