Question

решите систему уравнений фигурная скобка 2x-5y=12 4x-5y=24

Answer 1

2x-5y=12
4x-5y=24
отнимем
-2x=-12
x=6
12-5y=12
5y=0
y=0
(6;0)

Answer 2

$2x - 5y = 12 \\ 4x - 5y = 24$
$2x = 5y + 12 \\ 4x - 5y = 24$
$5y + 12 - 5y = 24 \\ y = 0$
$x = \frac{5y + 12}{2} = \frac{12}{2} = 6$