Question

Write an equation for a line passing through the points (c,2b) and (c,3b).

Answer 1

$(\fbox{c};\ 2b);\ (\fbox{c};\ 3b)-it's\ a\ vertical\ line:x=c$

Answer 2

equation of a line passing through two poins is given by (y - y1)/(x - x1) = (y2 - y1)/(x2 - x1)
(y - 2b)/(x - c) = (3b - 2b)/(c - c) = b/0
0(y - 2b) = b(x - c)
x - c = 0
x = c

Threfore, the required equation is x = c