Explicación paso a paso:
[tex]x + y = 7 \\ {x}^{2} + {y}^{2} = 29 \\ y= 7 - x \\ {x}^{2} + ( {7 - x)}^{2} = 29 \\ {x}^{2} + (49 - 14x + {x}^{2} ) = 29 \\ {x}^{2} + 49 - 14x + {x}^{2} = 29 \\ 2 {x}^{2} - 14x + 49 - 29 = 0 \\ 2 {x}^{2} - 14x + 20 = 0 \\ {x}^{2} - 7x + 10 = 0 \\ (x - 5)(x - 2) = 0 \\ (x - 5) = 0 \: \: o \: \: (x - 2) = 0 \\ x = 5 \: \: o \: \: x = 2[/tex]
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Explicación paso a paso:
[tex]x + y = 7 \\ {x}^{2} + {y}^{2} = 29 \\ y= 7 - x \\ {x}^{2} + ( {7 - x)}^{2} = 29 \\ {x}^{2} + (49 - 14x + {x}^{2} ) = 29 \\ {x}^{2} + 49 - 14x + {x}^{2} = 29 \\ 2 {x}^{2} - 14x + 49 - 29 = 0 \\ 2 {x}^{2} - 14x + 20 = 0 \\ {x}^{2} - 7x + 10 = 0 \\ (x - 5)(x - 2) = 0 \\ (x - 5) = 0 \: \: o \: \: (x - 2) = 0 \\ x = 5 \: \: o \: \: x = 2[/tex]