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Question

Find the equation of the straight line joining the points: (i) (2,3) and (4,1) (ii) (1,-1) and (3,5)

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Solution

Dear Student,

The equation of a line joining two given points x1, y1 and x2, y2 is given byy-y1=y2-y1x2-x1x-x1i. Using above expression, the equation of line joining 2, 3 and 4, 1 is as followsy-3=1-34-2x-2y-3=-22x-2y-3=-x-2y=-x+2+3y=-x+5ii. Similarly, the equation of line joining 1, -1 and 3, 5 is as followsy--1=5--13-1x-1y+1=62x-1y+1=3(x-1)y+1=3x-3y=3x-4

Regards

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