Question

решите систему уравнений 4x-y=7 3x+y=7
1)(-3;1) 2) (3;1) 3) (1; -3) 4) (-1; -3)

Answer 1

4х - y = 7
y = 4x - 7
3x + y = 7
y = 7 - 3x
4x - 7 = 7 - 3x
7x = 14
x = 2
y = 7 - 6 = 1
Ответ ( 2 ; 1 )