The problem statement, all variables and given/known data In this question, Earth is a plane described by the equation x + y + z = 18. Earth will be destroyed by an explosion that occurs at the point A = (1, 1, 1), also known as the “armageddon point”. It so happens that the school (considered as a point) will be the first place on Earth that is destroyed by this explosion. (a) Calculate the coordinates of the school. The attempt at a solution I don't get what the question is asking, if the school is first place to be destroyed, isn't it simply located at point A (1,1,1) ?