Answer:
7. x = 30
8. m9. x = 4
10. mStep-by-step explanation:
Questions 7 and 8:
We have a line crossing two other lines which are parallel, so the angles on the same side add up to 180º. Then
-3x + 100 + 6x - 10 = 180
3x + 90 = 180
3x = 180 - 90
3x = 90
x = 90/3
x = 30
Question 8: m
Questions 9 and 10:
Due to their positions, these angles are equal. So
-2x + 60 = 8x + 20
8x + 2x = 60 - 20
10x = 40
x = 40/10
x = 4
Question 10: m
