Question

Решить уравнение методом подстановки х-2у=3 3х-4у=10

Answer 1

X=3+2y

3(3+2y)-4y=10
9+6y-4y=10
2y=1
y=0.5

x-0.5*2=3
x=4
ответ: x=4; y=0.5

Answer 2

$\left \{ {{x - 2y = 3} \atop {3x-4y = 10}} \right. \left \{ {{x = 2y+3} \atop {3x-4y = 10}} \right. \left \{ {{x = 2y + 3} \atop {3(2y+3) - 4y = 10}} \right. \left \{ {{x = 2y+3} \atop {y = 0,5}} \right. \left \{ {{x = 4} \atop {y = 0,5}} \right.$