Answer:
x = -6
Step-by-step explanation:
y = -x equation 1
x + 6y = 30 equation 2
using equation 1 in equation 2 we have:
x + 6(-x) = 30
x - 6x =30
-5x = 30
x= -30/5
x= -6
Answer: question 5 is C
Question 6 is C
Question 7 is B
Step-by-step explanation:
Answer:
14 servings
Step-by-step explanation:
![\frac{9\ 1/3}{2/3} \\=\frac{28/3}{2/3}\\=\frac{28}{3} / \frac{2}{3} \\=\frac{28}{3} * \frac{3}{2} [Reciprocal]\\=28/2\\=14\ servings](https://tex.z-dn.net/?f=%5Cfrac%7B9%5C%201%2F3%7D%7B2%2F3%7D%20%5C%5C%3D%5Cfrac%7B28%2F3%7D%7B2%2F3%7D%5C%5C%3D%5Cfrac%7B28%7D%7B3%7D%20%2F%20%5Cfrac%7B2%7D%7B3%7D%20%5C%5C%3D%5Cfrac%7B28%7D%7B3%7D%20%2A%20%5Cfrac%7B3%7D%7B2%7D%20%5BReciprocal%5D%5C%5C%3D28%2F2%5C%5C%3D14%5C%20servings)
8 - 15 means subtract the positive number 15 from 8.
8 - 15 = 8 + (-15) = -7
8 - (-15) means subtract the negative number -15 from 8.
Subtracting a negative number is the same as adding a positive number.
8 - (-15) = 8 + 15 = 23
8 - 15 = -7, and 8 - (-15) = 23. The expressions mean different operations and have different answers.
