what times what equals to 15 but adds to negative 16

Well it they multiply to a positive then the 2 numbers must both be positive OR both be negative

BUT

they add to a negative  OR they must both be negative.

look at the multiply first

-1*-15=15

-3*-5=15

I do not think that there are any others

which of these pairs of numbers add to -16?

what can i multiply to get 15 but adds to negative 16