On comparing the ratios `a_1/a_2,b_1/b_2` and `c_1/c_2` without drawing them, find out whether the lines representing the following pair of linear equations intersect at a point, are parallel or coincide.
9x + 3y + 12 = 0, 18x + 6y + 24 = 0
Comparing the given equations with standard forms of equations `a_1 x + b_1 y + c_1 = 0 and a_2 x + b_2 y + c_2 = 0`
`a1 = 9, b_1 = 3, c_1 = 12;`
`a_2 = 18, b_2 = 6, c_2 = 24`
Thus, the lines representing the pair of linear equation coincide.