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Mathematics, 14.02.2021 14:00 jenesis8

2x - 3y = 9; 2x + y = 13 5x + 2y = -3; x + 5y = 4
(4) sm
1
3
99x + 101y = 499; 101x + 99 y = 501
49x - 57y = 172; 57x - 49y
49y = 252
Let's recall.
1 of a linear equation in two variables​

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2x - 3y = 9; 2x + y = 13 5x + 2y = -3; x + 5y = 4
(4) sm
1
3
99x + 101y = 499;...
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