Use the origin shown and the blue lines and numbers

Write the equations for lines $(1),(2),(3),4))=(mx+b$

$[$:$[$ Examplefor line $(2)],[(1200,0)(5400,-65)],[m=\frac{y}{x}=\frac{-65-0}{5400-1200}=-0\mathrm{.}0155,y=-0\mathrm{.}0155x+18\mathrm{.}6],[y=-0\mathrm{.}0155x+b,$ luse $x=1200,y=0)\}$