Question

решить систему 7u+2v=1
17u+6v=-9

Answer 1

7u+2v=1         /.(-3)
17u+6v=-9
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-21u-6u=-3
17u+6v=-9   /+
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-4u=-12, u=3
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2v=1-7u=1-7.3=1-21=-20
v=-10
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/u,v/=/3,-10/
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Answer 2

А можешь эти? 1)•6x=25y+1 •5x-16y=-4 2)•4b+7a=90 •5a-6b=20