To actually solve this, we can start by using the distributive property to get -5y-9=-y+1. Adding y and 9 to both sides to separate the variable, we get -4y=10. Next, we can divide both sides by -4 to separate the y and get y=-10/4, and since 4/4=1 and 8/4 =2 we can separate it into -2-1/2=-2.5
