Answer:
5x+3=3x+15
Subtract 3 from both sides
5x=3x+12
Subtract 3x from both sides
2x=12
Divide both sides by 2
Step-by-step explanation:
It's 1/3 which can = 0.3333...
Both lines are parallel so using the bottom line you are given angle 7 as being 80 degrees. Angle 5 and 7 form a straight line which is 180 degrees so angle 5 would be 180-80 = 100 degrees.
Angle 1 is the same as angle 5 so angle 1 is 100 degrees.
Answer: 100 degrees