2x+3=9
= 2x-6=0
X=6/2=3...in one variable
In 2 variables:-
2x+o.y-6=0
In this equation, just substitute the value of y as 0,1,-1 ...and u will get its solutions like, (3,0),(3,1),(3,-1)...
That is if you put y=0
Then 2x+0(0)-6=0
Then point is (3,0)
And y=1 then (3,1)