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Răspunsuri la întrebare
Răspuns:
Explicație pas cu pas:
a)x+3y=4 (7) 7x+21y=28 x=1
7x+y=8 (-1) -7x-y=-8 y=1
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20y=20 y=1 x=4-3=1
b)9x+y=9
6x-y=6
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15x=15 x=1 y=0
c) 4x+y=1 (3) 12x+3y=3
5x-3y=-3 5x-3y=-3
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17x=0 x=0 y=1
d)6x-y=0 12x-2y=0
8x+2y=0 8x+2y=0
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20x=0 x=0 y=0
e)4x+y=4 (7) 28x+7y=28
5x-7y=5 5x-7y=5
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33x=33 x=1 y=0
f)6x-3y=6 2x-y=2 (2) 4x-2y=4
4x+8y=4 x+2y=1 x+2y=1
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5x=5 x=1 y=0
2
a)DA -2x-2y=-16
2x+5y=31
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3y=15 y=5 x=8-5=3
b) NU 5x+4y=8
24x-4y=60
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29x=68 x=68/29 y=6×68/29-10