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x=(-2-3y)/2
x= -1 - 3/2.y
-3x+8y=5
-3.(-1-3/2y) +8y=5
3 + 9/2y +8y=5
9/2y + 16/2 y=5-3
25/2y=2
y= 2/ (25/2)
y= 4/25
2x+3y=-2
2x + 3.(4/25)=-2
2x=-2-(12/25)
2x= -50/25 - 12/25
2x= -62/25
x= (-62/25)/2
x=-62/50
x=-31/25
verifico=
2x+3y=-2
2.(-31/25)+ 3.(4/25)=-2
-62/25 + 12/25=-2
-50/25=-2
-2=-2
-3x+8y=5
-3.(-31/25) +8(4/25)=5
93/25 +32/25=5
125/25=5
5=5