Keisha bought 12 pounds of flour for $5.
How many dollars did she pay per pound of flour?

42 cents per pound

Step-by-step explanation:

to find the price for 1 pound, divide money with weight

price of 1 pound

42 cents approximately

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.