I forgot how to do this and I have a test help

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Which table represents a linear function? i'll give brainliest to first answer ^'^

Part a: sam rented a boat at $225 for 2 days. if he rents the same boat for 5 days, he has to pay a total rent of $480. write an equation in the standard form to represent the total rent (y) that sam has to pay for renting the boat for x days. (4 points)