hello
so for #3-8 you simply just substitute in the ordered pair into the equation. if the two sides are equal at the end then the ordered pair is a solution.
for example, for #3:
the equation is 2y+x=4
the ordered pair is (-2,3)
then substitute
2(3)+(-2)=4
6-2=4
4=4
the two sides are equal which means the ordered pair is a solution.
i hope this helps
have a nice day :)