I hope this picture helps, but next time try to chose a number to cancel out the fraction. Example, y=1/3x+4 chose 3,6,9 and other multiples of 3.
-4 is what you put on both sides Bc it’s half of b
I think that it would be (x times 2)
Answer 0.06*0.7+0.03=0.072 and 0.06*(-0.2)+0.03=0.018