Thread: [SOLVED] need a little help graphing some linear equations please!

The following pair of equations came with the instruction:
Solve by graphing.

2x+y=5
3x-y=10


I have solved questions like this before, however, this one proved rather hard so I put it into microsoft math and came out with these coordinates for the equations:

2x+y=5
(2,1) (4,-3)

3x-y=10
(1,-7) (2,-4)

I tried to work it out like this:

If 2x+y=5 then
y=5-2x

If:
x=0 y=5

x=1 y=3

x=2 y=1

x=3 y=-1
---------
If 3x-y=10 then
y=10-3x

If:
x=0 y=10

x=1 y=7

x=2 y=4

x=3 y=1

Is my working correct?

I think it is, but it never hurts to make sure.

Thanks in advance for your help!

Drakmord

Yes, it's correct. You might also want to have a look at http://www21.wolframalpha.com/input/?i=ContourPlot[{2x%2By%3D%3D5%2C3x-y%3D10}%2C{x%2C0%2C5}%2C{y%2C-7%2C3}]

Thank you very much for your help Zarathustra!


Drakmord