A point (x,y) is a solution to an equation if plugging in x and y results in a true statement.
Is (1,2) a solution of the equation y=2x?
A point is a solution to an equation if plugging in x and y results in a true statement.
Plug x=1 and y=2 into the equation and simplify.
y=2x



Plug in x=1 and y=2


Multiply 
Yes, 2=2.
So, the point (1,2) does satisfy the equation y=2x..
Is (1,0) a solution of the equation y=2x?
A point is a solution to an equation if plugging in x and y results in a true statement.
Plug x=1 and y=0 into the equation and simplify.
y=2x



Plug in x=1 and y=0


Multiply 
So, the point (1,0) does not satisfy the equation y=2x..