Respuesta :
in order to find out if its a fucntion you have to be able to graph it on
![Ver imagen lolovep45](https://us-static.z-dn.net/files/df2/66cf2c7126092236e850a56ec3c98908.jpg)
![Ver imagen lolovep45](https://us-static.z-dn.net/files/d1d/c471d33441632dba899f77be0d07c9e9.jpg)
its a function. this is because you can solve for k. it it were not a function, the equation would not make sense.