Answer:
see explanation
Explanation:
(1)
The 2 angles form a right angle, thus their sum is 90°, that is
4x + 3 + x - 8 = 90, that is
5x - 5 = 90 ( add 5 to both sides )
5x = 95 ( divide both sides by 5 )
x = 19
(2)
The 2 angles form a straight angle and sum to 180°, thus
7x + 10 + 3x = 180, that is
10x + 10 = 180 ( subtract 10 from both sides )
10x = 170 ( divide both sides by 10 )
x = 17