You can make your own -1 line by playing the -1.5 line risking a unit, and playing the ML to win a unit. Let's say Yanks are -150, and +105 -1.5.
Play 150/100 on yanks ML and 100/105 -1.5.
The play is essentially 250/205 Yanks -1, which translates to Yanks -1 [-122]
GL