The points A (3,5) and B (5,-8) lie on the line L1.
a) Find the gradient of L1
= i already did this, -13/2
A second line, L2, is perpendicular to L1.
b) Write down the gradient of L2
= 2/13
L2 passes through points P (5,0) and Q (t,2)
c) find the value of t.
= I DONT KNOW!!! can someone explain step by step how to get to the ans. thanks