Okay, here we have this:
Considering that this is a linear equation if we get two points, we can draw a line that will correspond to the function, so let's find it:
We are going to replace x with 1 and with 2:
x=1:
y=-5x
y=-5(1)
y=-5
We obtain (1,-5).
x=2:
y=-5(2)
y=-10
We obtain here (2,-10)
Now, let's graph this: