Question

теңдеулер жүйесін қосу тәсілімен шеш {5x+4y=-22 {5x-2y=-4​

Answer 1

$\displaystyle \tt \left \{ {{\sf 5x+4y=-22} \atop {\sf 5x-2y=-4 \: \: \: \: \: |\cdot(-1)}} \right. \to \left \{ {{\sf 5x+4y=-22} \atop {\sf -5x+2y=4}} \right. \\\\\\ \sf 6y=-18\\\sf y=-18\div6\\\sf y=-3\\\\ \sf 5x+4\cdot(-3)=-22\\\sf 5x-12=-22\\\sf 5x=-22+12\\\sf 5x=-10\\\sf x=-10\div5\\\sf x=-2$

ОТВЕТ:  (-2; 3)