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To find the equation y = mx, we need to find the slope, m, of the line that passes through the origin and the point (1,4).
The slope, m, of a line passing through two points (x1,y1) and (x2,y2) is given by:
m = (y2-y1)/(x2-x1)
Plugging in the values from the given points, we get:
m = (8-4)/(2-1)
m = 4
So the equation of the line y = mx through the origin with a slope of 4 is:
y = 4x