Question 82376
Simply substitute the points in place of X and Y in the equations. If the points satisfy the equation, then it is said to be a solution

For e.g. (1,1) and 2x+y = 3

Substituting
Left Hand side
2(1)+ 1 
 = 2+1
 = 3
 = Right Hand side
Thus (1,1) is a solution of the equation 2x+y = 3

Can you solve for the rest?