Answer:
x=3, y = 15
Explanation:
We can solve using the substitution method by substituting 3x+6 for y...
x+3x+6=18
Combine like terms
4x+6=18
4x=12
x=3
Now we need to find y. We can plug 3 in for x to solve for y...
y=3(3)+6
y=9+6
y=15
(x,y)=(3,15)
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