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The equation of a line is given by 𝑦=𝑎(𝑥−5)+4.If the 𝑦-intercept is −6, find the value of 𝑎.

Question

The equation of a line is given by 𝑦=𝑎(𝑥−5)+4.If the 𝑦-intercept is −6, find the value of 𝑎.

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Solution

Para encontrar el valor de a a en la ecuación de la línea y=a(x5)+4 y = a(x - 5) + 4 dado que la intersección con el eje y y es 6 -6 , sigue estos pasos:

  1. La intersección con el eje y y ocurre cuando x=0 x = 0 . Sustituye x=0 x = 0 en la ecuación de la línea: y=a(05)+4 y = a(0 - 5) + 4

  2. Simplifica la expresión: y=a(5)+4 y = a(-5) + 4 y=5a+4 y = -5a + 4

  3. Sabemos que la intersección con el eje y y es 6 -6 . Por lo tanto, sustituimos y=6 y = -6 en la ecuación: 6=5a+4 -6 = -5a + 4

  4. Resuelve para a a : 64=5a -6 - 4 = -5a 10=5a -10 = -5a a=105 a = \frac{-10}{-5} a=2 a = 2

Por lo tanto, el valor de a a es 2 2 .

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