What is 1/8 + 5/8 help

If on=8x-8,lm=7x+4,nm=x-5,and ol=3y-6

Item 1 which question could the expression 1000n answer? let n = the number of gallons of gas used. how many miles per gallon did the car get driving 1000 miles? let n = the number of grams of food needed for each dog. how many grams of food are needed to feed 1000 dogs? let n = the number of people at the show. how many empty seats were there at the show if there are 1000 seats at the theater? let n = the number of seats at the theater. how many empty seats will there by if 1000 people come to the show?

Write a linear funtion f with the values f(2)=-1, and f(5)=4