I think a. 8x+7x=90
That's how i usually do these type of questions.
~
x= 6
8x=48
7x=42
Answer:
select A,C,E, and F
Step-by-step explanation:
Answer:
The answer is b
Step-by-step explanation:
The equation is the following
![x^2- \frac{y^2}{100}](https://tex.z-dn.net/?f=x%5E2-%20%5Cfrac%7By%5E2%7D%7B100%7D)
This is a difference of two squares, the first one being the square of
![x](https://tex.z-dn.net/?f=x)
, the second one being the square of
![\frac{y}{10}](https://tex.z-dn.net/?f=%20%5Cfrac%7By%7D%7B10%7D%20)
. The difference of two squares can be factorized as
![A^2 - B^2 = (A+B)(A-B)](https://tex.z-dn.net/?f=A%5E2%20-%20B%5E2%20%3D%20%28A%2BB%29%28A-B%29)
If we apply this rule to our equation, we find