Question 164775
so lets call the 2 numbers a and b.  a+b= -3 and a-b= -27 now solve by substitution or similtaneously.  I choose substitution  so solving for the first equation a=-3-b  substituting this into the second equation we get -3-b-b=-27  adding 3 to both sides and combining like b terms gives us -2b=-24 dividing both sides by -2 gives us b=12   no plugging the value of b into either equation lets take the first a+12= -3 after subtracting 12 from both sides we get a= -15
so a= -15
   b= 12

checking by substituting these back into the original equations we see that we have found the correct answers.