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Condition for Coincident Lines
## Formula
For:
$$A_1x+B_1y+C_1=0$$
and:
$$A_2x+B_2y+C_2=0$$
the lines are coincident if:
$$\frac{A_1}{A_2}=\frac{B_1}{B_2}=\frac{C_1}{C_2}$$
## Usage
- Used to determine whether two equations represent the same straight line.
