Question 1055343
V1=I1*R1
V1=I2*R2, because the voltage is held constant
therefore, I1*R1=I2*R2
or
420*4=I2*14
(420)*(4/14)=120 ma.
If you write it differently, using I=V/R, then you have current inversely proportional to resistance or vice versa.
It can be set up with k, but the above way to me is easier.  The check is qualitative, and that is the current is less with more resistance, which one would expect.  Qualitatively, the resistance more than triples, so the current should be less than about 1/3, which it is.