Proving the Sum of the Interior Angle Measures of a Triangle Is 180°
Try it
Given y llz
Prove: m<5+ m<2 + m<6 = 180°
Angles Lines Statements Reasons
IN
=
y
А
M
3
2
Y
Statements
✓ 1. y || 2
✓ 2. 23-26
Reasons
1. given
2. alternate interior angles theorem
4.
5
6 7 z
C
B
Hint
h
O

Part a: explain why the x-coordinates of the points where the graphs of the equations y = 2−x and y = 8x+4 intersect are the solutions of the equation 2−x = 8x+4. (4 points) part b: make tables to find the solution to 2−x = 8x+4. take the integer values of x between −3 and 3. (4 points) part c: how can you solve the equation 2−x = 8x+4 graphically? (2 points)