Question Number 196964 by Mingma last updated on 05/Sep/23
Answered by Rasheed.Sindhi last updated on 05/Sep/23
$${x}+{y}=−\mathrm{9}\:\wedge\:{x}+\mathrm{2}{y}=−\mathrm{25} \\ $$$$\Rightarrow{x}+\mathrm{2}\left(−\mathrm{9}−{x}\right)=−\mathrm{25} \\ $$$$\:\:\:\:{x}−\mathrm{2}{x}=−\mathrm{25}+\mathrm{18}=−\mathrm{7} \\ $$$$\:\:\:\:\:\:\:{x}=\mathrm{7} \\ $$
Answered by Frix last updated on 06/Sep/23
$${I}\:\:\:\:\:\:\:\:\:\:\mathrm{2}{x}+\mathrm{2}{y}=−\mathrm{18} \\ $$$${II}\:\:\:\:\:\:\:\:\:\:\:{x}+\mathrm{2}{y}=−\mathrm{25} \\ $$$${I}−{II}\:\:\:\:{x}\:\:\:\:\:\:\:\:\:=\:\:\:\:\:\:\:\mathrm{7} \\ $$