Answer:
Yes
Explanation:
Slopes of perpendicular lines are opposite reciprocals of each other
to find if two lines are perpendicular:
(Slope1)*(Slope2) = -1
The slope of y=x+3 is 1 and the slope of x+y=6 is -1
(1)*(-1) = -1
-1 = -1
therefore, it is perpendicular