you have given one equation and there are two variables x and y.
x/2 + y/3 = 4 or x/8 + y/12 = 1
It is a straightline on the graph with x intercept as 8 units and y intercept being 12 units.
rewrite it as : y = 12 - 1.5 x
there are infinite number of solutions, if x ∈ (-∞, ∞). As for each real value of x , there is a real value of y , as above.
The solutions are in the form of couples: or coordinates: (x , 12 - 1.5 x), x ∈ R.