I don't really understand :/...please can someone help...Examine this graph. What are the y-intercept and slope of this line?

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

What is the difference between the equations of a vertical and a horizontal line?

Rounded to the nearest tenth, what is the value of x