SOLUTION: If x - 3y = 8 and y = 2x

SOLUTION: If x - 3y = 8 and y = 2x - 1 then x=

Question 316764: If x - 3y = 8 and y = 2x - 1 then x=
Found 2 solutions by jim_thompson5910, moshiz08:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Hint: Plug into to get
Answer by moshiz08(60) (Show Source): You can put this solution on YOUR website!
Let's plug into .
Then this becomes

Distributing the 3 gives

Combining like terms gives

Subtracting 3 from both sides gives

Dividing by -5 gives

Now we check: since y = 2x -1, plug in x=-1 to get y = 2(-1) - 1 = -3. Then we check that x - 3y = (-1) - 3(-3) = 8, so this works.
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