The sum of two integers is -80. If one of the integers is -90,then find the other. I need the answer with calculation!!!!!!

we should add both the integers and in last put a negative sign 
 

-71
 

the  answer is -71
 

if you subtract -80 -  -9= -71

Sum of two numbers is -80.
One number is -90. Then we have to find the other.
Let the other number be x.
Then,
 -90 + x = -80
Transpose -90 to RHS,
x = -80 + 90
x = 10.
Therefore, the second integer will be 10.

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-71

-10