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Find the equation of the straight lines passing through the following pair of point: `(a , b)a n d\ (a+b ,\ a-b)`

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So, the equation of the line passing through the two points is The formula used:
`y-y_1=frac{y_2-y_1}{x_2-x_1}(x-x_1)`
`y-b=frac{a-b-b}{a+b-b}(x-a)`
`(a-2b)x-by+b^2+2ab-a^2=0`
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