posted by Anonymous .
What is the slope of the line described by the equation below?
y - 9 = -2(x - 8)
first put it in slope intercept form
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) )