What would be the first step in when solving the following linear system by substitution? x = 4 + y
x - 2y = 10

Find the area of the unshaded square

Find the distance between the pair of points a(-1,8) and b(-8,4)

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