Answer :

[tex] \left \{ {{9x+2y=36} \atop {9x+8y=36}} \right. \\ y=- \frac{2}{9}x+4 \\ 9x+8(- \frac{2}{9}x+4) \\ 9x+ \frac{16}{-9} x+32 \\ 8 \frac{2}{9}x+32 [/tex]

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