Sorry to bother but can you help me with my math 31 - (-17) =?

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

Find y to the nearest hundreds place

Which linear function represents the line given by the point-slope equation y + 1 = –3(x – 5)?