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19-08-2016
Mathematics

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do,k(–7, y) → (14, –5)a 1.25b 2.5c 5 d 10

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dalendrk dalendrk

19-08-2016

k(-7; y) → (14; –5)

(14; -5) = (-7k; ky) therefore -7k = 14 and ky = -5

-7k = 14 ⇒ k = -2

subtitute to ky = -5

-2y = -5 |divide both sides by (-2)
y = 2.5

Answer: b. 2.5

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