how to find slope perpendiclur to 4x-8y=8

Question

anonymous · Answer

y=mx+c, then slope of the line perpendicular to this is , -1/m.
so the slope of the perpendicular line to y=x/2+1 is, -2.

anonymous · Answer

??

anonymous · Answer

answer is -2.
and the reason , i've given earlier, u got it?

anonymous · Answer

To find the slope of a line perpendicular to a given line, you take the inverse reciprocal.  That's a fancy math way of saying you turn the fraction upside-down and change the sign.  So, in your case you have the given line of
$$4x-8y=8$$or, in slope-intercept form
$$y=x/2-1$$
Your slope is the coefficient of x, r, in this case, 1/2.  Again, to find the slope of a perpendicular line, you take the inverse reciprocal (upside-down fraction with the sign changed).  That would be -2.