All of the following points lie on the graph of y = 2 xexcept
(0, 0)
(1, 2)
(2, 4)
(3, 8)

We have a line;
y=2x
Now , we find out with points belong to this line.
(0,0); it means: x=0 and y=0
y=2*0=0; therefore this point lie on the graph of y=2x.

(1,2); it means: x=1 and y=2.
y=2*1=2; therefore this point lie on the graph of y=2x.

(2,4), it means: x=2 and y=4.
y=2*2=4; therefore this point lie on the graph of y=2x

(3,8), it means: x=3 and y=8.
y=2*3=6≠8. Therefore thispoint doesn´t lie on the graph of y=2x.

All of the following points lie on the graph of y=2x, excpet (3,8).

)because it's going in order of the math sign

It says in the questions that it is 6.5?