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Автор - pticyna01

Алгебра 7 класс. Плз

Ответ

Автор - Dushzhanov987
 left { {{6x-4y=3} atop {-3x+2y=4}} right.
6(4-2y)-4y=3
24-12y-4y=3
-16y=-18
y=1.125
-3x+2.25=4
-3x=4-2.225
-3x=1.775


 left { {{3x-9y=3} atop {2x+3y=5}} right.
3(5-3y)-9y=3
15-9y-9y=3
-18y=-12


 left { {{5x-9y=-24} atop {-4x+3y=-6}} right.
5(-6-3y)-9y=-24
-30-15y-9y=-24
-24y=6
y=-0.25
-4x-0.75=-6
-4x=-6+0.75
-4x=-5.25
x=1.3125

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