SOLUTION: 2) 3x+y=2 4x+y=20 This is a Substitution problem and i need help

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Question 127720:

2) 3x+y=2 4x+y=20

This is a Substitution problem and i need help
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
3X+Y=2 OR Y=-3X+2
4X+(-3X+2)=20
4X-3X+2=20
X=20-2
X=18 ANSWER.
3*18+Y=2
54+Y=2
Y=2-54
Y=-52 ANSWER.
PROOF:
4*18-52=20
72-52=20
20=20