we have that

solve for y
-------> equation 
so
Assume a value of x and then with the equation calculate the value of y
<u>case N 1)</u> Assume 
substitute in the equation
and find the value of y

therefore
<u>the answer Part 1) is</u>
The pair of negative integers is 
<u>case N 2) </u>Assume 
substitute in the equation
and find the value of y

therefore
<u>the answer Part 2) is</u>
The pair of negative integers is 