Answer:
y=3
Step-by-step explanation:
y=-4x+11
3x+y=9
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3x+(-4x+11)=9
3x-4x+11=9
-x+11=9
-x=9-11
-x=-2
x=2
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3(2)+y=9
6+y=9
y=9-6=3
x=2, y=3.
