Question 278114
x=y+4
3x<5y
3(y+4)<5y
3y+12<5y
3y-5y<-12
-2y<-12
y>-12/-2 [ note the sign change when dividing by a negative value.
y>6 ans.
x=6+4
x=10
Proof:
Let y=6.1
3*10<5*6.1
30<30.5