With part i from the attached image

Write two subtraction equations that are equivalent to 5 + 12 = 17.

Complete the equation of the line through (−10,3) and (−8,−8). use exact numbers.

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