find

intercept on x -axis is 2 means line passes through (2,0)

and it is inclined at an angle of 135^o with positive y axis, it will make the same angle from positive x-axis(it can be seen from geometry easily )  i.e. slope of line is m = tan135^o = -1

so line y = mx +c

y = - x + c

passes through (2,0)  ==> c = 2

so y = -x +2 is the desired line.