Answer:
Follow the same thing for the rest (plug the given in)
Step-by-step explanation:
1. y= 2x
x+y= -18
Plug 2x for y
x+2x= -18
3x=-18
x= -6
2.
x= 3y-1
x+2y=9
Plug 3y-1 for x
3y-1 +2y=9
5y= 10
y= 2
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