Question

what adds to -13 and multiplies to 42

Answer 1

-2 * -21=42
    -2-21= -23   NOPE

-3*-14 = 42
    -3-14= 17  NOPE

-7*-6= 42
     -7-6 = -13  YES!!!

The answer is -7 and -6.

Answer 2

-6 multiple by -7 equals 42. when you add them = -13.
-6*-7= 42
-6+-7= -13