Please help me i hope its enough points for you

Three times the sum of a number and seven is negative thirty-six. what is the number?

Do some research and find a city that has experienced population growth. determine its population on january 1st of a certain year. write an exponential function to represent the city’s population, y, based on the number of years that pass, x after a period of exponential growth. describe the variables and numbers that you used in your equation.

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined