Question

Х - Зу = 7
2х - бу = 12
need help.
solving systems by elimination.​

Answer 1

{x - 3y = 7              | · (-2)

{2x - 6y = 12

{-2x + 6y = -14

{2x - 6y = 12                    (+)

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-2x + 2x + 6y + (-6y) = -14 + 12

0 = -2

contradiction

x, y ∈ ∅