Answer: The number is 10.
4-8x=84
-8x=84-4
-8x=80
x=![\frac{80}{-8}](https://tex.z-dn.net/?f=%5Cfrac%7B80%7D%7B-8%7D)
x=-10
In math, the associative and commutative properties are laws applied to addition and multiplication that always exist. The associative property states that you can re-group numbers and you will get the same answer and the commutative property states that you can move numbers around and still arrive at the same answer.
Im not entirely sure but i thinks its c
8.76582 × 10 to the 3rd power, that's how many hours there are in a year using scientific notation.
Answer:
a
Step-by-step explanation:
y = 3x - 7 → (1)
4x - 5y = - 20 → (2)
substitute y = 3x - 7 into (2)
4x - 5(3x - 7) = - 20
4x - 15x + 35 = - 20
- 11x + 35 = - 20 ( subtract 35 from both sides )
- 11x = - 55 ( divide both sides by - 11 )
x = 5
substitute x = 5 into (1)
y = 3(5) - 7 = 15 - 7 = 8
solution is (5, 8 )