(7x+5y=-5 /*3
(5x+3y=1 /*(-5)
21x+15y= - 15
-25x-15y = -5
21x + (-25x) = -15+(-5)
21x - 25x = -15-5
-4x = -20
x = 5
y=(1-5x)/3 = (1-25)/3 = -24/3 = -8
ОТВЕТ: (5; -8)
(7x+5y=-5 /*3
(5x+3y=1 /*(-5)
21x+15y= - 15
-25x-15y = -5
21x + (-25x) = -15+(-5)
21x - 25x = -15-5
-4x = -20
x = 5
y=(1-5x)/3 = (1-25)/3 = -24/3 = -8
ОТВЕТ: (5; -8)