Can somebody help me with this. Will make brainliest.

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

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?