Yes, but if you do so you would have A = 3*l* c

Let say you have l = 1 cm cuvette, then its A = 3*c

So if you put in c = 0,1 mol/l then you get A = 0,3 and not 0,7 and for 0,2 mol/l you would get for A 0,6 and not 1

The equation doesn't fulfill Lambert Beer. But if you calculate the straight line as

y = mx+ b you get a blank.

The result is y = 3x+ 0.4

y= 3*0.1 + 0.4 = 0.7

y =3*0.2 + 0.4 = 1