Luke goes to the fair with $50. Each ride costs $2. If an equation is written to show how much money Luke has at the end of the day, what is the slope and y-intercept?

a) slope= 50; y-intercept= 2

b) slope= 25; y-intercept= 50

c) slope= 25; y-intercept= 2

d) slope= 2; y-intercept= 50