Question 1128490
<br>
Saying that the slope of a perpendicular line is the "negative reciprocal" of the slope of the first line does NOT mean the slope is a negative number.  It means the slope of the perpendicular line is the reciprocal of the slope of the given line, MULTIPLIED BY NEGATIVE 1.<br>
If the slope of the first line is -1/4, then the reciprocal of that slope is -4/1, and the slope of the perpendicular line is -1(-4/1) = 4/1 = 4.