Geometry help pleseeee

Transversal t cuts parallel lines a and b as shown in the diagram. Which equation is necessarily true?

1. m Angle 1 =  m Angle 2

2.  m Angle4 = m Angle 6

3.m Angle 1+ m angle 5 =  9O degrees

4. m Angle 3 + m angle 5 = 180 degress

5. m Angle 7 = m angle 8