Question 341556
Substitute values for x and y.
I'll do one you do the rest.
{{{y=2x-4}}}
{{{x=0}}}
{{{y=-4}}}
{{{-4=2(0)-4}}}
{{{-4=-4}}}
True, so ({{{0}}},{{{-4}}}) is a solution. 
Now do the rest of the ordered pairs in the same way.