Answer:
C) ![A+\frac{2}{5}B](https://tex.z-dn.net/?f=A%2B%5Cfrac%7B2%7D%7B5%7DB)
Step-by-step explanation:
Given Equations:
A) ![\frac{2}{5}x+y=12](https://tex.z-dn.net/?f=%5Cfrac%7B2%7D%7B5%7Dx%2By%3D12)
B) ![\frac{5}{2}y-x=6](https://tex.z-dn.net/?f=%5Cfrac%7B5%7D%7B2%7Dy-x%3D6)
In order to eliminate
we need to multiply
to equation B and add it to A.
Multiplying
to B.
⇒ ![\frac{2}{5}\times (\frac{5}{2}y-x)=\frac{2}{5}\times 6](https://tex.z-dn.net/?f=%5Cfrac%7B2%7D%7B5%7D%5Ctimes%20%28%5Cfrac%7B5%7D%7B2%7Dy-x%29%3D%5Cfrac%7B2%7D%7B5%7D%5Ctimes%206)
⇒ ![(\frac{2}{5}\times\frac{5}{2}y)-(\frac{2}{5}x)=\frac{12}{5}](https://tex.z-dn.net/?f=%28%5Cfrac%7B2%7D%7B5%7D%5Ctimes%5Cfrac%7B5%7D%7B2%7Dy%29-%28%5Cfrac%7B2%7D%7B5%7Dx%29%3D%5Cfrac%7B12%7D%7B5%7D)
⇒ ![y-\frac{2}{5}x=\frac{12}{5}](https://tex.z-dn.net/?f=y-%5Cfrac%7B2%7D%7B5%7Dx%3D%5Cfrac%7B12%7D%7B5%7D)
Adding it equation A.
![\frac{2}{5}x+y=12](https://tex.z-dn.net/?f=%5Cfrac%7B2%7D%7B5%7Dx%2By%3D12)
+ ![-\frac{2}{5}x+y=\frac{12}{5}](https://tex.z-dn.net/?f=-%5Cfrac%7B2%7D%7B5%7Dx%2By%3D%5Cfrac%7B12%7D%7B5%7D)
We get ![2y=\frac{72}{5}](https://tex.z-dn.net/?f=2y%3D%5Cfrac%7B72%7D%7B5%7D)
Thus
is eliminated.
So, the expression used to eliminate
is:
![A+\frac{2}{5}B](https://tex.z-dn.net/?f=A%2B%5Cfrac%7B2%7D%7B5%7DB)
Answer:
After 10 weeks: 40 inches
Step-by-step explanation:
Equation
15 + 2.5w = h
15 = beginning height
2.5 = rate per week
w = weeks passed
h = total height
Answer:
The answer is C :)
Step-by-step explanation:
Answer:
just add the zeros in 507
so, you will get 50700