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568463
@568463
July 2022
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пж даю 14 б только так что б было расписано
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wejde
Verified answer
1.
x+2y=12, 2x-3y=-18
x=12-2y, 2(12-2y)-3y=-18
x=12-2y, 24-4y-3y=-18
x=12-2y, 24-7y=-18
x=12-2y, 7y=24+18
x=12-2y, 7y=42/:7
y=6, x=12-2*6
y=6, x=0
Ответ: (0;6)
2.
6(x+y)=5-(2x+y), 3x-2y=-3y-3
6x+6y=5-2x-y, 3x=-3y+2y-3
6x+2x=5-y-6y, 3x=-y-3
8x=5-7y, y=-3-3x
y=-3-3x, 8x=5-7(-3-3x)
y=-3-3x, 8x=5+21+21x
y=-3-3x, 8x=26+21x
y=-3-3x, 21x-8x=-26
y=-3-3x, 13x=-26/:13
x=-2, y=-3-3*(-2)
x=-2, y=-3+6
x=-2, y=3
Ответ: (-2;3)
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Answers & Comments
Verified answer
1.x+2y=12, 2x-3y=-18
x=12-2y, 2(12-2y)-3y=-18
x=12-2y, 24-4y-3y=-18
x=12-2y, 24-7y=-18
x=12-2y, 7y=24+18
x=12-2y, 7y=42/:7
y=6, x=12-2*6
y=6, x=0
Ответ: (0;6)
2.
6(x+y)=5-(2x+y), 3x-2y=-3y-3
6x+6y=5-2x-y, 3x=-3y+2y-3
6x+2x=5-y-6y, 3x=-y-3
8x=5-7y, y=-3-3x
y=-3-3x, 8x=5-7(-3-3x)
y=-3-3x, 8x=5+21+21x
y=-3-3x, 8x=26+21x
y=-3-3x, 21x-8x=-26
y=-3-3x, 13x=-26/:13
x=-2, y=-3-3*(-2)
x=-2, y=-3+6
x=-2, y=3
Ответ: (-2;3)