Write the equation of line passing through the pints (4,3) and ( -18, 24).

There are a lot of ways

One is to write the slope two ways
slope = (y-3)/(x-4)
slope = (24 -3)/-18 -4) = 21/-22
then
(y-3)/(x-4) = -21/22
22 y -66 = -21 x + 84
22 y + 21 x = 150