Please help me. I can't find this out

-1
-1
5
-1,3
hope this helps!<3

Y=3x+1 so the first one

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.