Объяснение:
[tex]x - y = 2 \\ 2x - 3y = 5 \\ x = 2 + y \\ 2(2 + y) - 3y = 5 \\ 4 + 2y - 3y = 5 \\ - y = 1 \\ y = - 1 \\ x = 2 +( - 1) = \\ 2 - 1 = 1 \\ (1. \: \: \: - 1)[/tex]
[tex]x + y = 2 \\ 5x + 2y = 1 \\ y = 2 - x \\ 5x + 2(2 - x) = 1 \\ 5x + 4 - 2x = 1 \\ 3x = - 3 \\ x = - 1 \\ y = 2 - ( - 1) = 2 + 1 = 3[/tex]
[tex]2x - y = 5 \\ 2x + 3y = - 7 \\ y = - 5 + 2x \\ 2x + 3( - 5 + 2x) = - 7 \\ 2x - 15 + 6x = - 7 \\ 8x = 8 \\ x = 1 \\ y = - 3[/tex]
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Объяснение:
[tex]x - y = 2 \\ 2x - 3y = 5 \\ x = 2 + y \\ 2(2 + y) - 3y = 5 \\ 4 + 2y - 3y = 5 \\ - y = 1 \\ y = - 1 \\ x = 2 +( - 1) = \\ 2 - 1 = 1 \\ (1. \: \: \: - 1)[/tex]
[tex]x + y = 2 \\ 5x + 2y = 1 \\ y = 2 - x \\ 5x + 2(2 - x) = 1 \\ 5x + 4 - 2x = 1 \\ 3x = - 3 \\ x = - 1 \\ y = 2 - ( - 1) = 2 + 1 = 3[/tex]
[tex]2x - y = 5 \\ 2x + 3y = - 7 \\ y = - 5 + 2x \\ 2x + 3( - 5 + 2x) = - 7 \\ 2x - 15 + 6x = - 7 \\ 8x = 8 \\ x = 1 \\ y = - 3[/tex]