Question

решите систему уравнений 3x+y=4 2x-y=1

Answer 1

3x + y = 4
y = 4 - 3x
2x - 4 + 3x = 1
5x = 5
X = 1
y = 4 - 3 = 1
Ответ ( 1 ; 1 )

Answer 2

$left { {{3x+y=4} atop {2x-y=1}} right.$

$left { {{3x+y=4} atop {5x=5}} right.$

$left { {{3x+y=4} atop {x=1}} right.$

$left { {{3+y=4} atop {x=1}} right.$

$left { {{x=1} atop {y=1}} right.$