Answer:
x=-2/3, y=14/3. (-2/3, 14/3).
Explanation:
x+y=4
y=2x+6
x+2x+6=4
3x+6=4
3x=4-6
3x=-2
x=-2/3
-2/3+y=4
y=4-(-2/3)
y=4+2/3
y=12/3+2/3
y=14/3
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