Question

решить систему уравнений . Вверху: 2x - 5y =-21 внизу: 3x +4y = 3

Answer 1

(x;y)=(-3;3)

Пошаговое объяснение:

$\displaystyle \left \{ {{2x-5y=-21} \atop {3x+4y=3}} \right.$

$\displaystyle \left \{ {{y=\frac{-21-2x}{-5} } \atop {3x+4*\frac{21+2x}{5}=3}} \right.$

$\displaystyle \left \{ {{y=4,2+0,4x } \atop {3x+16,8+1,6x=3}} \right.$

$\displaystyle \left \{ {{y=4,2+0,4x } \atop {3x+1,6x=3-16,8}} \right.$

$\displaystyle \left \{ {{y=4,2+0,4x } \atop {4,6x=-13,8}} \right.$

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

$\displaystyle \left \{ {{y=4,2-1,2 } \atop {x=-3}} \right.$

$\displaystyle \left \{ {{y=3 } \atop {x=-3}} \right.$