SOLUTION: 3x+4y=2 x-y=1

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Question 89811: 3x+4y=2
x-y=1
Answer by checkley75(3666) About Me  (Show Source):
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X-Y=1 OR X=Y+1 NOW SUBSTITUTE (Y+1) FOR X & SOLVE FOR Y
3(Y+1)+4Y=2
3Y+3+4Y=2
7Y=2-3
7Y=-1
Y=-1/7 ANSWER.
X=-1/7+1
X=6/7 ANSWER.
PROOF
3*6/7+4*-1/7=2
18/7-4/7=2
(18-4)/7=2
14/7=2
2=2