Answer:
x =
![- \frac{ 1}{7}](https://tex.z-dn.net/?f=%20%20-%20%5Cfrac%7B%201%7D%7B7%7D%20)
y =
![\frac{61}{7}](https://tex.z-dn.net/?f=%20%5Cfrac%7B61%7D%7B7%7D%20)
Step-by-step explanation:
Since both expressions 2x+9 and 9x+10 are equal to y, set them equal to each other forming an equation in x
2x+9 = 9x+10
Now, solve the equation:
2x-9x = 10-9
-7x = 1
x =
![- \frac{1}{7}](https://tex.z-dn.net/?f=%20-%20%20%5Cfrac%7B1%7D%7B7%7D%20)
Then, substitute the given value of x in any of the two equations given, let's take y = 2x+9
y = 2×(-1/7)+9
y =
![\frac{61}{7}](https://tex.z-dn.net/?f=%20%5Cfrac%7B61%7D%7B7%7D%20)
That's it! I hope that this explanation was helpful ;)
The percent of the sales tax would be 5%.
Answer:
A pair of angles whose sum is not 90 or 180 is not an angle pair.
Stephen will get 6 pounds