1. Finding angles with algebraic expressions

2. You need to take the concepts that we have learned to find the value of x
5x x + 20

3. What do we know about these angles
5x x + 20

4. What do we know about these angles They add up to 180
5x x + 20

5. Set the two equations so they add up to 180
5x x + 20 = Now solve for x
6x + 60 = 180
6x = 120
X = 20
5x x + 20

6. What do you know about these angles
5x x + 70

7. What do you know about these angles They are equal to each other
5x x + 70

8. Set the equations equal to each other and solve for x
5x + 10 = 2x + 70
-2x
3x + 10 = 70
- 10
3x = 60
X = 20
5x x + 70

9. Find x
2x x+ 30

10. Find x
10x + 10
3x + 59