Determine a relationship between x- and y-values. Write an equation.
{(1, -1), ( 2, -2), (3, -3), (4, -4)
mmmhhh
did you notice that the y is always the negative of the x ???
so .....
Is the answer y = -x, then?
x=-y
so that would be the general expresion
or even better you could say that x+y=0
Algebra teachers like it more :)