What are the answers to the yellow boxes?

[tex] \frac{ - 16}{ - 4 \times 1} = \frac{ - 16}{ - 4} [/tex]
Since, Both sides are equal we can eliminate one of them and then divide the given equation i.e.
[tex] - 16 \div - 4[/tex]
Now, When we divide (-) & (-) we get the answer in (+).. So, Our answer will be
[tex]4[/tex]
Final answer:-