# ??

Dear Student,

We know : point - slope form of the equation is :

( yy1 ) = m ( xx 1 )

Here we can see from the graph point ( - 400 , 0 ) ( Where line intersect x - axis )  and ( - 700 , 400 ) ( Red point on the graph )

Here , We have :  x 1 = - 400  , y1 = 0  and x 2 = - 700  , y2 = 400

And we know :  Slope m  = , Substitute all values we get

m  = , So we get our point - slope form :

( y - 0 ) = $-\frac{4}{3}$ ( x - ( - 400 ) )

( y - 0 ) = $-\frac{4}{3}$ ( x +  400 )                                                      ( Ans )