What is the equation of the line perpendicular to # y=-3/7x+12 # at #x=-1 #?
Perpendicular means that the slopes will be opposite, so the slope is (7/3). At x = -1 the original line y value is
To find the new constant at that point we put it into the new equation.
So the new line equation is
CHECK: At (-1, (87/7))