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x-2y=-9
________-
2x=-6
x=-3
x-2y=-9
-3-2y=-9
-2y=-9+3
-2y=-6
y=-6/-2 = 6/2
y=3
X-2y= - 9
---------------
2x= - 6
X= - 3
3x-2y=-15
3(-3) - 2y= - 15
-9 - 2y= - 15
-2y= - 15+9
-2y= - 6
Y= 3
3x-2y= - 15
3(-3) - 2(3)= - 15
-9 - 6= 15
X- 2y= -9
-3 - 2(-3)= - 9
-3 - 6= - 9