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puteri [66]
3 years ago
9

A variable needs to be eliminated to solve the system of equations below. Choose the

Mathematics
1 answer:
AURORKA [14]3 years ago
8 0
Two different things u can do
Substitution:
X-9y=12
+9y +9y
X=9y+12

-3(9y+12)+9y=36
-27y-36+9y=36
+36 +36
-18y = 72
/-18 /-18
Y = -4


Or whatever this other I’ve is called

-3x-9y=36
-1(X-9y)=(12)-1

-3x-9y=36
-x+9y=-12

-4x=24
X= -6
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Solve the following system algebraically.
Vitek1552 [10]

Answer:

B

Step-by-step explanation:

-x - 1 = x^2 + x

x^2 + 2x + 1 = 0

(x+1)(x+1) = 0

x = -1 (double soution)

y = 1-1 =

y =0

(-1,0) = double solution

7 0
3 years ago
Anyone know the answer
sergij07 [2.7K]
When y=3/x translated right 3 units , we get y = 3/(x-3).
Then we translate y = 3/(x-3) , 3 units up and get y = 3/(x-3) +3.
So the answer is B.
y=3/(x-3) + 3

3 0
3 years ago
Read 2 more answers
The total cost (in dollars) of producing x food processors is C(x) = 2500 + 50x -0.28.
Darya [45]

Answer:

The exact cost of producing the 21st food processor is $38.52.

The marginal cost to approximate the cost of producing the 21st food processor is $38.24

Step-by-step explanation:

Consider the provided function.

C(x) = 2500 + 50x -0.28x^2

(A) Find the exact cost of producing the 21st food processor

The exact cost producing 21st food processor is C(21)-C(20)

Substitute x=21 in above function.

C(x) = 2500 + 50(21) -0.28(21)^2

C(x) = 2500 +1050 -123.48

C(x) = 3426.52

Substitute x=20 in above function.

C(x) = 2500 + 50(20) -0.28(20)^2

C(x) = 2500 +1000-112

C(x) = 3388

The exact cost producing is:

C(21)-C(20)=3426.52-3388=38.52

Hence, the exact cost of producing the 21st food processor is $38.52.

Part (B) Use the marginal cost to approximate the cost of producing the 21st food processor,

To find the marginal cost first differentiate the function with respect to x.

C(x) = 2500 + 50x -0.28x^2

C'(x) =50-0.56x

Now substitute x=21 in above function.

C'(x) =50-0.56(21)

C'(x) =50-11.76

C'(x) =38.24

The marginal cost to approximate the cost of producing the 21st food processor is $38.24

5 0
3 years ago
Maya is saving money to buy a game. So far she has saved $12 , which is three-fourths of the total cost of the game. How much do
Lubov Fominskaja [6]

Answer:

$16

Step-by-step explanation:

12 = 3/4g

cross-multiply to get:

3g = 48

g = 48/3

g = 16

4 0
3 years ago
A pillow that usually costs $18 is marked down 25%. Which expressions can be used to find the new price of the pillow?
Misha Larkins [42]

n= new price

n=18-(18*0.25)

8 0
4 years ago
Read 2 more answers
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