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To find the equation of a line, we need to know either 1) slope and one point on the line 2) 2 points on the line

The question states that line m passes through the origin (0,0). But does not mention the slope. Hence we can't determine its equation.

-------------- Statement 1 => Horizontal distance = 5 units. i.e X-intercept of line l = 5 units. But we still don't know the slope. This statement in not sufficient.

Statement 2=> Y intercept of line l = 2.5 units. No info on slope This statement is not sufficient.

Together 1 & 2 => 2 points on line l (x intercept & y intercept). Which allows to determine equation of line l. The slope of line l and origin (0,0) gives equation of line m.