Question

6x=7-4y; x=-2,-1,0

Answer 1

Plug it in.
x=-2
6(-2)=7-4y
-12=7-4y
4y=19
y=19/4

Answer 2

Now plug in x=-1
6(-1)=7-4y
-6=7-4y
4y=13
y=13/4

Answer 3

Finally plug in x=0
6(0)-7-4y
0=7-4y
4y=7
y=7/4