The equation of a line with slope m and passing through (0, 0) is :

1. x = my

2. y = mx

3. m = y – x

4. m = y + x

We know that,

Equation of line:

y - y₁ = m (x - x₁)

Substituting values in equation :

y - 0 = m(x - 0)

y = mx.

Hence, option 2 is the correct option.