Posted by Anonymous on Monday, April 30, 2012 at 5:34pm.
first put it in slope intercept form
y=mx +b
m is the slope and b will give you the y intercept
y-9 = -2(x-8)
multiply everyting in the parenthesis by -2
y-9= -2x + 16
and then plus 9 from both side
y= -2x + 25
your slope is -2
the equation is in the form
y - y1 = m(x - x1) where (x1, y1) is a point and m is the slope.
By the "just-looking-at it" principle, the slope is -2
(and a point on it is (8,9) )
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