Line Through a Point Parallel to a Given Direction

Rarely Tested

Line Through a Point Parallel to a Given Direction

## Formula

For point $$(x_1,y_1)$$ and direction ratios $$a:b$$:

$$\frac{x-x_1}{a}=\frac{y-y_1}{b}$$

## Usage

- Used when the direction of the required line is known.

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