Two equations in a system of equations are consistent and dependent when the graph of both the equations are the same and it is not possible to find a unique solution for the variables which would have been possible in case the graphs of the two equations intersected only at a single point.

Here we have to find a_1, b_1, c_1, a_2, b_2, c_2 such that a_1 x + b_1 y = c_1 and a_2 x + b_2 y = c_2 are consistent and dependent.

This is possible when a_2/a_1 = b_2/b_1 = c_2/c_1 = k which is a constant.

**When the ratio of a_2 and a_1, b_2 and b_1 and c_2 and c_1 is the same the equations are consistent and dependent.**