5(7x+2y)-11y=6(2x+y)+2 33+3(6x-5y)=3(x+2y)-5y - вопрос №39069195721162233365325 от yoyo97 16.11.2020 18:54

Question

Математика: 5(7x+2y)-11y=6(2x+y)+2 33+3(6x-5y)=3(x+2y)-5y

yoyo97 · Answer

5(7x+2y)-11y=6(2x+y)+2 35x+10y - 11y = 12x+6y+2 23x-7y = 2 *16
33+3(6x-5y)=3(x+2y)-5y 33+18x - 15y = 3x+6y -5y 15x-16y = -33 *7

368x - 112y =32 (1) (1)-(2) 263x = 263 x = 1 x=1 x=1
105x -112y = -231 (2) 23x- 7y = 2 y = (23x-2)/7 y=(23-2)/7 y=3