Answer:
2nd option
Step-by-step explanation:
the scale factor is the ratio of corresponding sides, image to original, so
scale factor =
=
=
= 1 
Is only work in the third.
The answer is X = 6
Because 3 times 2 x is 6x ... then -1 plus 1 is 0 so it levels out and x is 6
Use photomath it is a really good app u should try it