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4b-6b+6-4b=-b(6+4)+b(6+4)=(6+4)(-b+b)=6+4=10
<span>3x+2y=8
2x+y=-3
</span>3x+2(-2x-3)<span>=8
y=-2x-3
3x-4x-6=8
</span>y=-2x-3
-x=14
y=-2x-3
x=-14
y=-2x-3
x=-14
y=-2*(-14)-3
x=-14
y=25