solving equations to put into a graph: 3x + y = 12, etc

[Guest]

when i have
3x+y=12
xy=9

how do i solve those two equasions so that they can be put into a graph
THANK YOU

 

[stapel]

Hint: If they'd given you "3 + y = 12, solve for y", what would you have done?

Hint: If they'd given you "3y = 9, solve for y", what would you have done?

Eliz.