Ready lesson 8 independent practice

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove