Answer:
The y-intercept is 450, and it represents how much money he has in his account when he starts out with 0 essays proofread
Explanation:
Looking at the standard slope-intercept equation, we see:
y = mx + b
Where b is the y-intercept. In our equation, our b is replaced by 450:
y = 15x + 450
So, the y-intercept is 450, and it represents how much money he has in his account when he starts out with 0 essays proofread.
Hope this helped!