Answer:
7.5
Step-by-step explanation:
5/6=x/9
cross multiply
6x=45
x=45/6
x=7 3/6 = 7 1/2 = 7.5
True. If they never intersect then they must have the same slope and are parallel
Answer:
Step-by-step explanation:
Answer:

Step-by-step explanation:
Move the -4 over to the other side.

Divide both sides by 3.

Answer: 
You can write this as (-infinity, 7) if you aren't able to use the infinity symbol.
====================================================
Explanation:
Think of x < 7 as writing 
So x is between negative infinity and 7, excluding both endpoints.
To write
in interval notation, we write
The curved parenthesis tell us to exclude the endpoint.