Answer:
7x
Step-by-step explanation:
Assuming your expression is :

Then we simplify as follows
since 
since 
since 
Please refer to the picture.
Answer:
answer for number 9 : slope is 3/7 and the y intercept is (0, -2/7 )
answer for number 10 : slope is 4/7 and the y intercept is (0,10)
Step-by-step explanation:
here i hope this helped you