Question

0.4+0.3y=1.7 ; 0.7-0.2y=0.8

Answer 1

y=-3/26 is the answer

Answer 2

0.4+0.3y=1.7
0.3y=1.7-0.4
0.3y=1.3
y=1.3/0.3
y=13/3

0.7-0.2y=0.8
-0.2y=0.8-0.7
-0.2y=0.1
y=-1/2