2x=9-y
x=(9-y)/2
[tex] \frac{9 - y}{2} - y = 12[/tex]
[tex] \frac{9 - y}{2} \times 2 - y \times 2 = 12 \times 2[/tex]
[tex]9 - y - 2y = 24[/tex]
9-3y=24
-24+9=3y
-15=3y
-5=y
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Verified answer
2x=9-y
x=(9-y)/2
[tex] \frac{9 - y}{2} - y = 12[/tex]
[tex] \frac{9 - y}{2} \times 2 - y \times 2 = 12 \times 2[/tex]
[tex]9 - y - 2y = 24[/tex]
9-3y=24
-24+9=3y
-15=3y
-5=y