The highest point in Argentina is 6,960 meters above sea level. The lowest point is 105 meters below sea level. What is the difference between the highest and lowest points?

7,065 meters.

Step-by-step explanation:

The problem is asking for "the difference" between two points. "The difference" means you're subtracting. The second point says it is below sea level, though. That makes it a negative number. Thus:

When subtracting by a negative number, think of it as addition, since the negative cancels out the subtraction sign. This turns it into:

There is a 7,065 meter difference between the two points.

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.

step by step explanation: when u removing the parentheses and combined them that would be : x+3y-x-y=2y