-9 + -3 = ?

The negative 3 makes the positive sign a negative, so the equation would be -9-3=y

Then, you can do it two ways. 

1st way: You can subtract 3 from -9, which will be -12

2nd Way: You can add 3+9, then switch it to negative, so 3+9=12

-12=y

Hope this helped

-9+-3=-12

Because they are both negatives and The negative -9 adds negative -3 more so -12 

Negative 12