please help.

I am trying to work out a solution to a question and am having a difficulty that is probably so easy to most people out there...

I think that it is a linear equation thing, and i have read up on them on a very useful site given to me by one of the members! (THANKS!)...

It could be my working out, but i keep coming up with decimals in my T Chart...

i'm going to try and explain it, so here goes... (please don't feel rude for telling me i'm an idiot, and i am doing the completley wrong thing)...

I have the two equations...

3x + 4y = 78

2x + 6y = 72

I have to put these onto a graph, and find the value of x & y by the point of intersection.

I rearranged the two equations to find the value of x and got...

x = -(6/2)(y)+36

x = -(4/3)(y)+26 ... (Feel free to tell me if i am wrong allready)

When putting these into a T Chart, and enterring a value for y, i keep coming up with decimals...

eg... y = 2

(-4 devided by 3) (2) + 26 = 23.33 recurring.

... the first equation i have comes up perfect everytime... please tell me where i have gone wrong, so i can put this information into a graph!!