complete the equation describing how x and y are related

Answer: The answer is y=2x+7
I answered earlier to but I didn't notice there was a picture, sorry.
Step-by-step explanation:
1. 7-9= -2
2. 0-1= -1
3. -2/-1= 2
4. pick a point, I picked (1,9) we know that x=1 and y=9
5. fill in y=2x+b
6. 9-2(1)=b
7. 7=b
If this helps please mark as brainliest