Question 113852
b and c.
y=mx+b
In order to form perpendicular lines the slope(m) of one has to be the negative reciprocal of the other.
the negative reciprocal of 3 is -1/3 and vice versa.
Ed
{{{graph(500,500,-10,10,-10,10,3x-4/7,-x/3+4/7)}}}