Question 5435
gradient, m is defined as {{{(y[2] - y[1])/(x[2] - x[1])}}}.


Which is {{{(x[1])}}},{{{y[1]}}}? IT DOES NOT MATTER!!!! Just pick one and stick with that decision:


so, i shall do both versions to show you, you get the same answer:


so, either m = (r-5)/(8-4) = -4
(r-5)/4 = -4
r-5 = -16
r = -11


OR m = (5-r)/(4-8) = -4
(5-r)/-4 = -4
5-r = 16
-r = 11
r = -11


jon.