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x=9-2y
Sustituyes en la primera
2(9-2y)+3y=4
18-4y+3y=4
Reagrupas terminos
-y=-14 tienes y=14
Sustituyes y en la segunda ya despejada
x=9-2(14)
x=9-28
x=-19
Comprobando
(1) 2(-19)+3(14)=4
- 38+42=4
4=4
(2) (-19)+2(14)=9
- 19+28=9
9=9