Give the equations of two lines passing through (3, 12). How many more such lines are there, and why?

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2 Answers

The equation of two lines passing through 

(3, 12) are

4x - y = 0

3x - y + 3 = 0

There are infinitely many lines passing through (3, 12).

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Since a = 3 and b = 12 is the solution of required equations. So we have to find the set of any two equations which satisfy this point. 

Consider 4a – b = 0 and 3a – b + 3 = 0 set of lines which are passing through (3, 12). 

We know, infinite lines can be pass through a point. So, there are infinite lines passing through (3, 12).

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