The graph of the equation 𝑎𝑥+𝑏𝑦=4ax+by=4 is a line in the 𝑥𝑦xy-plane, where 𝑎a and 𝑏b are constants. If the line contains the points (−2,8)(−2,8) and (1,−3)(1,−3), what is the value of 𝑎+𝑏a+b ?A−8−8 B66 C2222 D2828
Question
The graph of the equation 𝑎𝑥+𝑏𝑦=4ax+by=4 is a line in the 𝑥𝑦xy-plane, where 𝑎a and 𝑏b are constants. If the line contains the points (−2,8)(−2,8) and (1,−3)(1,−3), what is the value of 𝑎+𝑏a+b ?A−8−8 B66 C2222 D2828
Solution
Primero, vamos a sustituir los puntos dados en la ecuación de la línea para obtener dos ecuaciones con las incógnitas y .
Para el punto :
Para el punto :
Ahora tenemos el siguiente sistema de ecuaciones:
Vamos a resolver este sistema de ecuaciones. Primero, multiplicamos la segunda ecuación por 2 para que los coeficientes de sean opuestos:
Ahora sumamos esta ecuación a la primera ecuación:
Sustituimos en la segunda ecuación:
Finalmente, sumamos y :
Por lo tanto, la respuesta es:
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