In a right triangle, one angle is equal to 90 degrees while the sum of the other two angles are also 90 degrees. In this case, x is a right angle, so it equals 90 degrees. We know that one of the other angles is 47 while the second is y. So, y+47=90. To find y, we subtract 47 from 90, which is 43 degrees. y=43 degrees.