Answer:
3x-7y
Step-by-step explanation:
9x^2 - 49y^2
find the square root of a values
=3x-7y
Answer:
C
Step-by-step explanation:
Once

We know that 
There are infinity values for
, but considering 
Below we have all the solutions for 
Negative:

Positives:

We can see that 
B because gradient of the first line is 4/-6 which is -2/3
Answer:
The second one I think
Step-by-step explanation:
Answer:
pretty sure is the first one
Step-by-step explanation:
-1/2x +3 =3x -4