Ответ:
Пошаговое объяснение
1)
x=-y
(3x+y)/ 2 + (x+10y)/ 3 = 2
(3*(-y)+y )/2 + (-y+10y) / 3 = 2
y=1
x=-1
(-1;1)
2)
x= 48/31 + 7y/31
x+6y/14 - 8x-3y/10 = 0
(48/31 + 7y/31v+6y)/14 - (8*(48/31 + 7y/31)-3y)/10 = 0
(48+193y)/434 - (384-37y)/310 = 0
5*(48+193y) - 7(384 - 37y) = 0
240 +965y -2688 +259y=0
1224y=2448
y=2
x=48/31 + 7*2/31
x=2