To find the intersection point of the equations \( y = -x + 4 \) and \( y = 3x \), we can set the two equations equal to each other:
\[ -x + 4 = 3x \]
Next, we solve for \( x \):
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Add \( x \) to both sides: \[ 4 = 4x \]
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Divide by 4: \[ x = 1 \]
Now that we have \( x \), we can substitute it back into either of the original equations to find \( y \). Using \( y = 3x \):
\[ y = 3(1) = 3 \]
Therefore, the intersection point of the two lines is:
\[ \boxed{(1, 3)} \]