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uhkelsay
Since y=x-4 you would simply just plug that into 'y' on the other equation, given: x-4=3x+2.
Subtract x from both sides, it will leave you with -4=2x+2.
Next you would subtract 2 from both sides, leaving you with -6=2x.
All you need now is to get rid of the coefficient in front of 'x' so you divide both sides with 2, leaving you with your answer: -3=x.

Answer: -3=x

Hope this helps!
MarkV
Hi there! The answer is x = -3

y = 3x + 2
y = x - 4

Since y equals 3x + 2 AND y equals x - 4, we can say that 3x + 2 equals x - 4. So, we get
[tex]3x + 2 = x - 4[/tex]

Collect the terms (subtract x from both sides and subtract 2 from both sides)
[tex]2x = - 6[/tex]

Divide by 2
[tex]x = \frac{ - 6}{2} = - 3[/tex]

Therefore x = -3

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