#### Answer

a.$102^{\circ}$
b.$9^{\circ}$

#### Work Step by Step

a. The two angles are supplementary, so they add to 180 degrees. Therefore, to find the measure of angle x,
$180-78=102^{\circ}$
a. The two angles are complementary, so they add to 90 degrees. Therefore, to find the measure of angle y,
$90-81=9^{\circ}$