Distance formula help

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.

What is the slope of the line that passes through the points (–9, 2) and (0, 4)? the slope of the line is

1/4x+5=3/4. i can't get access to the answer to this question! and, my request on "contact us" will not go