find slope of line
goes up -4 units and goes 2 units to left, -4/2=-2
y=-2x+b
where does it hit y axis? at y=3
y=-2x+3
ok so line of inequality is dotted
see a point in that shaded area
(3,0)
0=-2(3)+3
0=-6+3
0=-3
false
but
0>-3 is true, so
y>-2x+3 is the equaiton