None. They're all acute angles.
Answer:

Step-by-step explanation:
Given
Direct variation implies that:

Where k is the constant of variation.

Required
Find y when 

Make k the subject

For: 

For: 
becomes

Substitute 

Make y the subject




Answer: Option (4)
Step-by-step explanation:
The graph has a y-intercept of 2.
- Eliminate options (1) and (3).
The graph passes through (2,4).
This leaves option (4) as the correct answer.
Answer:
-3/2
Step-by-step explanation:
If the first equation is 9x +3/4y = 6, then the solution would look like this:

An appropriate multiplier is -3/2.
So your answer would be 7 because if you divide 21÷3 your answer would be 7.