Please help me answer this with explanation.

(9x-5) - (x+12) what’s the answer and also explain how to do it i need it for a test tomorrow

The table represents a linear function. what is the slope of the function? –6 –4 4 6

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.