Quick does anyone know this please give me the right answer ( this is due in 20 minutes)

2-digit numbers less than 91 which are 1 less than a multiple of 10

Complete the equation of the line through (−10,3) and (−8,−8). use exact numbers.

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?