[tex]x+5y=12[/tex]
The problem is giving us a coordinate (x,y): (4,?).
Then, to know which value satisfies the latter in the given equation, we have to replace x by 4 as follows:
[tex]4+5y=12[/tex]
Finally, isolating for y we get the result.
[tex]5y=12-4[/tex][tex]y=\frac{8}{5}=1.6[/tex]
Answer: ( 4, 8/5 )
