In January, David began putting the same amount of money each month into his savings account. In February, he had $85 in his account, not including interest. By June, he had $135 in his account, not including interest. How much money was in the savings account before David began saving each month? *

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.

show us the triangle so we can answer it