How can i find the slope and y-intercept ? do i have to use some specific calculator?

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

Plot the intercepts to graph the equation

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost