To find out how many cans the soup kitchen will have left after 10 days, we can substitute \( x = 10 \) into the equation \( y = -63x + 825 \).
\[ y = -63(10) + 825 \] \[ y = -630 + 825 \] \[ y = 195 \]
Therefore, the soup kitchen will have 195 cans left after 10 days.