Posted by **Yvette** on Tuesday, December 20, 2011 at 11:37pm.

Solve the system of equations by graphing. Then classify the system. x+y=9 x-y=3 Use graphing tool to graph the system

- Univ of Phoenix -
**Reiny**, Wednesday, December 21, 2011 at 9:28am
Just mentally add them to get

2x = 12

x = 6, then mentally 6+y = 9 ---> y = 3

Unless the purpose of graphing these two simple equations is to illustrate how graphing two lines shows their intersection as the solution to the system of equations, in this case "graphing" would be my last choice to solve the system.

Secondly, how do you expect us to know which "graphing tool" is available to you.

My favourite would be a sheet of graphing paper, and a sharp pencil

- algebra -
**drwls**, Wednesday, December 21, 2011 at 9:28am
We have no idea what your "graphing tool" is, but surely you can plot both equations and see where they intersect. Alternatively, note that 2x = 12, so that x = 6.

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