Question

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

Answer 1

- 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