Answer:
(6, 5 )
Step-by-step explanation:
Given the 2 equations
4x + 8y = 64 → (1)
7x - 2y = 32 → (2)
Multiplying (2) by 4 and adding to (1) will eliminate the y- term
28x - 8y = 128 → (3)
Add (1) and (3) term by term, that is
32x = 192 ( divide both sides by 32 )
x = 6
Substitute x = 6 into either of the 2 equations
Substituting x = 6 into (1)
4(6) + 8y = 64, that is
24 + 8y = 64 ( subtract 24 from both sides )
8y = 40 ( divide both sides by 8 )
y = 5
Solution is (6, 5 )
Answer:d
Step-by-step explanation:
I just took the test and got it wrong
To find the inverse of an equation just switch the places of the x and y, then solve for y like so...
(keep in mind that f(x) means the same thing as y)
original equation:
y = 4x + 8
switching x and y:
x = 4y + 8
x - 8 = 4y
- 2 = y
Hope this helped!
~Just a girl in love with Shawn Mendes
Answer:
The answer is B. 7
Step-by-step explanation:
3 + x = 10
3 + 7 = 10
Answer:
15 black water bottles
Step-by-step explanation:
let w represent white water bottles, and let b represent black water bottles.
set up a system of equations:
w+b=20
w+2b=35
(the top equation shows that the number of white water bottles he sold and the number of black water bottles he sold equals to 20, since it says that the total number of water bottles is 20. the bottom equation shows that white water bottles cost $1, and black water bottles cost $2, and that the total amount of money he got from selling them is $35).
in the top equation, isolate w:
w+b=20
w=20-b
now we do substitution. in the bottom equation, substitute 20-b for w:
w+2b=35
20-b+2b=35
then, solve:
b+20=35
b=15
this means that he sold 15 black water bottles.
