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aikenbeiker
@aikenbeiker
July 2022
1
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Решите систему уравнений
-5х + 5у = -2
-5х + 9у = 4
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Answers & Comments
selmash21
Домножим первое на -1
5х-5у=2
-5х+9у=4
сложим
5х-5х-5у+9у=2+4
4у=6
у=6/4=1.5
-5х+9×1.5=4
-5х+13.5=4
5х=13.5-4
5х=9.5
х=9.5/5
х=1.9
(1.9;1.5)
5 votes
Thanks 5
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Answers & Comments
5х-5у=2
-5х+9у=4
сложим
5х-5х-5у+9у=2+4
4у=6
у=6/4=1.5
-5х+9×1.5=4
-5х+13.5=4
5х=13.5-4
5х=9.5
х=9.5/5
х=1.9
(1.9;1.5)