Respuesta :

u = -5
That is the answer

Good morning,

Answer:

u=-5

Step-by-step explanation:

the line D:y=-3x+b

A(-5,1)∈D ⇔ 1= -3(-5)+b ⇔ b= -14

then D:y=-3x-14

B(-3,u)∈D ⇔ u=-3(-3)-14 ⇔ u=-5

look at the photo below for more info.

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