Please help the questions are in the picture above

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

Find the value of x for which the lines are parallel.

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning