find the equation of a line // to the y axis and passing through the point (a) (1,3), (b) (-2,3).
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(a) (1,3) (b) (-2,3)
(x1,y1). (x2,y2)
AB= √(x2-x1)²+(y2-y1)²
= √(-2,1)²+(3-3)²
= √(3)²+(0)²
=√9 unit
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