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The equation of a line passing through the origin (0,0) has the form y = mx, where m is the slope of the line.
For the equation y = 3x, the slope is 3, so this line goes through the origin.
For the equation y = 6x, the slope is 6, so this line goes through the origin.
For the equation x + y = 3, rearrange it to y = -x + 3. This line does not go through the origin, as it intersects the y-axis at y = 3.
Therefore, the equations of the lines through the origin are y = 3x and y = 6x.