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2 years ago

3x + 3y =15 and x = -3y -1

Mathematics

1 answer:

saul85 [17]2 years ago

4 0

Answer:

(x, y) = (8, -3)

Step-by-step explanation:

You can substitute for x in the first equation:

3(-3y -1) +3y = 15

-6y = 18 . . . . . add 3 and simplify

y = -3 . . . . . . . divide by -6

x = -3(-3) -1 = 8 . . . . find x using the second equation

The solution to this system of equations is (x, y) = (8, -3).

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Lostsunrise [7]

Answer:

B. 121 I'm sorry if its not correct

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3 years ago

Which expression can be used to find the price of a $400 telescope after a 32% markup? Select all that apply. A. 400 • 0.32 B. 4

irina1246 [14]

Answer: Option 'C' is correct.

Step-by-step explanation:

Since we have given that

Original price of a telescope = $400

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7 0

3 years ago

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vitfil [10]

Answer:

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Step-by-step explanation:

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3 years ago

How do you do inequalities

fgiga [73]

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8 0

2 years ago

The total cost, in dollars, to order x units of a certain product is modeled by C(x)=5x²+320 . According to the model, for what

lora16 [44]

Answer:

The minimum cost per unit is obtained for an order of 8 units.

Step-by-step explanation:

Since the total cost is modeled by;

C(x)=5x²+320

Then;

1 unit costs; C(x)=5(1)²+320 = 325

cost per unit 325/1 = 325

8 units costs; C(x)=5(8)²+320 = 640

cost per unit = 640/8 = 80

80 units costs; C(x)=5(80)²+320 = 32320

Cost per unit = 32320/80 = 404

The minimum cost per unit is obtained for an order of 8 units.

7 0

2 years ago