1). 1/3x=10-5/2y x=(10-5/2y)*3 x=30-15/2y 2/15*30-2/15*15/2y+y/3=4 4-y+y/3=4 -2/3y=0 y=0 x=30-0 x=30 Проверка 30/3+15*0/2=10 10=10 2) 1/3x=y/5-5 x=(y/5-5)*3 (3/5y-15)*1/5+3/25y=3 6/25y=6 y=25 x=(25/5-5)*3 x=0 Проверка 0/3-25/5=-5 -5=-5