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  1. The equation of this graph is


    1. y = – x
    2. y = – 3x
    3. y = x
    4. y = 3x
Correct Option: D

Given Here , y1 = 6 , y2 = -3 , x1 = 2 and x2 = -1
We know that ,
The equation of two points on given line is

( y - y1 ) =
y2 - y1
( x - x1 )
x2 - x1

( y - 6 ) =
-3 - 6
( x - 2 )
-1 - 2

( y - 6 ) =
9
( x - 2 )
3

⇒ y - 6 = 3( x - 2 ) ⇒ y = 3x
Hence , required equation is y = 3x .



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