Answer:
first angle: x=6. second angle: x=20
Explanation:
The first angles are complementary as they add up to 90 degrees.
The second angles are supplementary as they add up to 180 degrees.
to find x for the first angle, set up the equation: 10x+30=90. 10x=60, x=6.
to find x for the second angle, set up the equation: (4x+40)+3x=180. 7x+40=180, 7x=140, x=20.