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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

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Solution

Primero, vamos a sustituir los puntos dados en la ecuación de la línea para obtener dos ecuaciones con las incógnitas aa y bb.

Para el punto (2,8)(-2, 8): a(2)+b(8)=4 a(-2) + b(8) = 4 2a+8b=4 -2a + 8b = 4

Para el punto (1,3)(1, -3): a(1)+b(3)=4 a(1) + b(-3) = 4 a3b=4 a - 3b = 4

Ahora tenemos el siguiente sistema de ecuaciones: 2a+8b=4 -2a + 8b = 4 a3b=4 a - 3b = 4

Vamos a resolver este sistema de ecuaciones. Primero, multiplicamos la segunda ecuación por 2 para que los coeficientes de aa sean opuestos: 2(a3b)=2(4) 2(a - 3b) = 2(4) 2a6b=8 2a - 6b = 8

Ahora sumamos esta ecuación a la primera ecuación: 2a+8b+2a6b=4+8 -2a + 8b + 2a - 6b = 4 + 8 2b=12 2b = 12 b=6 b = 6

Sustituimos b=6b = 6 en la segunda ecuación: a3(6)=4 a - 3(6) = 4 a18=4 a - 18 = 4 a=22 a = 22

Finalmente, sumamos aa y bb: a+b=22+6=28 a + b = 22 + 6 = 28

Por lo tanto, la respuesta es: 28 \boxed{28}

This problem has been solved

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