Question

sum of two integers is -45,If one of them is -15 find the other

Answer 1

$$\begin{gathered} \mathrm{Let}\mathrm{the}\mathrm{other}\mathrm{integer}=x \\ \mathrm{one}\mathrm{of}\mathrm{the}\mathrm{integer}=-15 \\ \mathrm{sum}\mathrm{of}\mathrm{the}\mathrm{integers}=-45 \\ \mathrm{now}, \\ x+\left(-15\right)=-45 \\ \Rightarrow x-15=-45 \\ \Rightarrow x=-45+15 \\ \Rightarrow x=-30 \\ \mathrm{so}\mathrm{the}\mathrm{other}\mathrm{integer}=-30 \end{gathered}$$