Answer:
y = (9/2)x + 12
Explanation:
The y-intercept is 12 because when the number of games on the x-axis is 0 the cost on the y-axis was 12. The slope is 9 over 2 because the slope is rise over run and if you count up from one point to the next whole number point you get 9 and if you count over from there horizontally you get 2.