Answer:
x = 6
Explanation:
y = -x - 4
3x + y = 8
Substitute the y with -x - 4
3x - x - 4 = 8
Combine the terms
2x - 4 = 8
Move the constant to the other side
+4 +4
2x = 12
Divide both sides by 2
2x/2 = 12/2
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