Plot a function with two variables in Wolfram|Alpha?

Questions
,
1

Is it possible to input a function like this into WA:

f(x,y) = (3x - y, x - 5y)

So far I wasn’t successful.

2

Things like this

WA link

and this

WA link

seem to usually work for relatively simple expressions, but trying to assign a name to the function and use that name does not seem to be supported with any notation that I have been able to find.

3

Something is wrong with the second link. But thanks anyway! :slight_smile:

4

Something is corrupting the second link. I verified the WA code worked, pasted the link above and then trying to use the link fails.

It was trying to show that both Table and Map can be used in limited ways to simulate some functions within WolframAlpha.