Question 203071: If X-3Y=8 and Y=2x+1; X=?
Answer by RAY100(1637)   (Show Source):
You can put this solution on YOUR website! (1) x-3y=8
(2) y=2x+1
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subst (2) into (1)
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x-3(2x+1) =8
x-6x -3 =8
-5x=11
x=-11/5
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y= 2(-11/5) +1
y=-22/5 +5/5
y=-17/5
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check,,,(1) (-11/5) -3(-17/5) =8
-11/5 + 51/5 = 40/5 =8,,,,ok
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(2) -17/5 =2(-11/5) +1
-17/5 = -22/5 +5/5 = -17/5,,,,ok
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