The two angles are complementary, meaning the sum of the two angles equals to 90. Let the degree of the smaller angle be x. degree of the larger angle be y. x+y= 90 y= 4x-10 x+4x-10= 90 5x= 100 x= 20 y= 4(20)-10= 70 And: The degree of the smaller and larger angles are 20 and 70 respectively.