Explanation:
#1 eq → x + y = -13
#2 eq → x - 2y = -8
Elimination for x
x + y = -13
x - 2y = -8
________ _
3y = -5
y = -5/3 → value of y
Find x :
x - 5/3 = -13
x = -13 + 5/3
x = -39/3 + 5/3
x = -34/3 → value of x
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