BaldorBásico1 respuestas

Ecuaciones por igualación :7x + 4y = 135x - 2y = 19?

Ecuaciones por igualación : 7x + 4y = 13 5x - 2y = 19.

Calculadora interactiva

ax² + bx + c = 0

En resumen

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Mejor respuesta

Ericksanchez123
4

<img src="https://tex.z-dn.net/?f=%20%5Cleft%20%5C%7B%20%7B%7B7x%2B4y%3D13%7D%20%5Catop%20%7B5x-2y%3D19%7D%7D%20%5Cright.%20" />

<img src="https://tex.z-dn.net/?f=Despejamos%5C%3Ay%5C%3Ade%5C%3Aambas%5C%3Aecuaciones%3A" />

<img src="https://tex.z-dn.net/?f=%20%5Cleft%20%5C%7B%20%7B%7By%3D%20%5Cfrac%7B13-7x%7D%7B4%7D%20%7D%20%5Catop%20%7By%3D-%5Cfrac%7B19-5x%7D%7B2%7D%20%7D%7D%20%5Cright.%20" />

<img src="https://tex.z-dn.net/?f=Igualamos%5C%3Alas%5C%3Aexpresiones%3A" />

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B13-7x%7D%7B4%7D%3D-%5Cfrac%7B19-5x%7D%7B2%7D" />

<img src="https://tex.z-dn.net/?f=-26%2B14x%3D76-20x" />

<img src="https://tex.z-dn.net/?f=%5Cmathrm%7BSumar%5C%3A%7D26%5Cmathrm%7B%5C%3Aa%5C%3Aambos%5C%3Alados%7D%3A" />

<img src="https://tex.z-dn.net/?f=-26%2B14x%2B26%3D76-20x%2B26" />

<img src="https://tex.z-dn.net/?f=14x%3D-20x%2B102" />

<img src="https://tex.z-dn.net/?f=%5Cmathrm%7BSumar%5C%3A%7D20x%5Cmathrm%7B%5C%3Aa%5C%3Aambos%5C%3Alados%7D%3A" />

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Reemplazamos el valor de x en una de las ecuaciones :

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Soluciones x = 3 ; y = - 2.