The first integer is -7.
Step-by-step explanation:
Let,
x, x+1, x+2 be the integers.
According to statement.
[tex]x+(x+1)+(x+2)= -18\\x+x+1+x+2=-18\\3x+3=-18\\3x=-18-3\\3x=-21\\Dividing\ both\ sides\ by\ 3\\\frac{3x}{3}=\frac{-21}{3}\\x=-7[/tex]
The first integer is -7.
Keywrods: Integers, addition
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