Question

Система уравнения
x-y=4
2x-3=16

Answer 1

x-y=4
2x-3=16

x-y=4
2x=19

x=9,5
y=х-4

x=9,5
y=9,5-4

x=9,5
y=5,5

(9,5;5,5)

Answer 2

x-y = 4
2x - 3 = 16

2x = 19
x = 9,5

y = x - 4
y = 5,5

Ответ: (9,5; 5,5)

если
x - y = 4
2x - 3y = 16

x = 4 + y
2(4+y) - 3y = 16

x = 4+y
8 - y = 16

y = -8
x = 4 - 8 = -4

Ответ: (-4; -8)