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erastovalidia [21]
3 years ago
9

X+3y=2 and y=2x+3 Please explain using substitution method.

Mathematics
1 answer:
kotegsom [21]3 years ago
5 0

- X + 3Y = 2  (*)

⇔X = 2 - 3Y  (1)

- Y = 2X + 3   (2)

(1),(2)⇒ Y = 2(2 - 3Y) +3

       ⇔ Y = 4 - 6Y + 3

       ⇔ Y = 1  (**)

(*),(**)⇒ X + 3×1 =2

       ⇔ X = -1

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