Please help I need help with my hw

The speed of a falling object increases at a constant rate as time increases since the object was dropped. which graph could represent the relationship betweent time in seconds, and s, speed in meters per second? speed of a falling object object over time

How do you use the elimination method for this question? explain, because i really want to understand!

Aline has a slope of and a y-intercept of –2. what is the x-intercept of the line?