The graphs of the functions in problems 5 - 8 are straight lines. Calculate each length (a) using the distance formula between 2 points and (b) by setting up and evaluating the arc length integrals. 5. y= 1 +2x for Osx$2. 6. y=5-x for Isx$4. 7. x=2+t, y=1 -2t for Ost