Question

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

Answer 1

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

ОТВЕТ:  (-2; 3)