3 years ago

Find the solution of the system of equations. 3x – 3y = 18 3x – 8y = -2

Mathematics

1 answer:

Oksi-84 [34.3K]3 years ago

5 0

Answer:

x=10, y=4

Step-by-step explanation:

3x-3y=18

(-)3x-(-)8y=-(-)2 -3x+8y=2 add to first equation to eliminate x

5y=20

y=4

substitute y with 4

3x-3(4)=18

3x=30

x=10

x=10,y=4

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6(3x - 2) + 5(x + 6)

andreyandreev [35.5K]

Answer:

x=3.5

Step-by-step explanation:

1. Multiply

18x-12=5x+30

2. Move the x's to one side

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3. Isolate the variable by dividing

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7 0

3 years ago

a sand timer has 5 5/16 ounces of sand. of sand falls at a rate of 2.5 ounces per minute, how many minutes will the timer last?

Hitman42 [59]

Answer:

about 2 minutes

Step-by-step explanation:

first lets make everything in the same term

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then divide 5 5/16 by 2 1/2

or 85/16 divided by 5/2

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3 years ago

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dybincka [34]

Answer: 3,3

Step-by-step explanation:

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3 years ago

Since 1995 the cost of a bag of groceries has increased about 2.5% each year. The equation C = 25(1.025)x will give the value of

Marianna [84]

Answer: 28 years

Step-by-step explanation:

Given

The equation showing the value of the bag after x years is $C=25(1.025)^x$

If the price of the bag increased by 2.5%, from the equation, we can deduce that

Initial cost of the bag is 25

Double of the initial value is 50

Insert it in the equation

$\Rightarrow 50=25(1.025)^x\\\Rightarrow 2=1.025^x\\\text{Taking natural log}\\\Rightarrow \ln 2=x\ln (1.025)\\\\\Rightarrow x=\dfrac{\ln 2}{\ln 1.025}\\\\\Rightarrow x=28.07\approx 28$

It will take 28 years

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3 years ago

Can someone please help me on these?

JulijaS [17]

The answer is C 7v-1

7 0

3 years ago

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