Having a problem figuring out how to solve these types of math problems, any would be appreciated. use substitution to solve the system the explanations provide in aleks does not make sense to me. -3x + y = -11 2x + 5y = 30

Answer this two poles, ab and ed, are fixed to the ground with the of ropes ac and ec, as shown: two right triangles abc and edc have a common vertex c. angle abc and edc are right angles. ab is labeled 13 feet, ac is labeled 15 feet, ec is labeled 10 feet, and ed is labeled 4 feet.what is the approximate distance, in feet, between the two poles? 11.14 feet16.65 feet14.35 feet15.59 feet