Actually, it depends on the value of m  where  m is not equal to 0.

Suppose, m = 1  
Therefore (x,y) will be (1,1) , (2,2) , (3,3) ......  and so on. 

Suppose m = 2

Therefore (x,y) will be (1,2) , (2,4) , (3,6)  ....... and so on.

Suppose m = 3

Therefore (x,y) will be (1,3) , (2,6) , (3,9) .......  and so on.

Thus we randomly decide value of 'm' or the value is given in the question.
Normally  we take m = 2.

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   The graph of equation of type  y = m x  represents a straight line that passes through the origin (0, 0).

    If  m is a real quantity,  m ∈ (-∞, ∞), then,  all the lines passing through the origin will  cover the entire area of x y plane.