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Dahasolnce [82]
3 years ago
5

2x+7y=3x=−4y​what is x and y

Mathematics
2 answers:
Leno4ka [110]3 years ago
5 0

Answer:

x = 12

y = -3

Step-by-step explanation:

Solving for Y

2x + 7y = 3

x = -4y

2(-4y) + 7y = 3

-8y + 7y = 3

-1y = 3

-1y/-1 = 3/-1

y = -3

Solving for X

x = -4y

x = -4(-3)

x = 12

Checking Work

2(12) + 7(-3) = 3

24 + -21 = 3

3 = 3

x = -4y

x = -4(-3)

x = 12

12 = 12

natima [27]3 years ago
3 0

Answer:

x=-4

y=-3

Step-by-step explanation:

2(-4y)+7y=3

-8y+7y=3

y=-3

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Answer:

y = x*(6 feet/1 fathom)

Step-by-step explanation:

We know the relation:

1 fathom = 6 feet.

We can write:

1 = (6 feet/1 fathom)

Now, remember that any number multiplied by 1 does not change.

Then suppose that we have a measure of 3 fathoms, then:

3 fathoms = (3 fathoms)*1

= (3 fathoms)*((6 feet/1 fathom)) = (3 fathoms/1 fathom)*(6feet)

= 3*(6 feet) = 18 feet.

So we changed the units by multiplying the original measure by  (6 feet/1 fathom)

Then, if x is the depth of water in fathoms and y is the depth of the water in feet, we can write:

y = x*(6 feet/1 fathom)

3 0
3 years ago
IMPORTANT!! in a unit circle, what is the relationship between arc length and central angle?
Ugo [173]

The measure of an arc refers to the arc length divided by the radius of the circle. The arc measure equals the corresponding central angle measure, in radians. That's why radians are natural: a central angle of one radian will span an arc exactly one radius long.

5 0
3 years ago
Sam invested $48,000 some at 6% interest and the rest at 10% . How much did he invest at each rate if he received $4,000 in inte
emmainna [20.7K]

<u>Answer with step-by-step explanation:</u>

We are given that Sam invested $48,000 at 6% interest and the rest at 10%. Given that he received $4,000 interest in one year, we are to find how much he invest at each rate.

Assuming the amount invested at 6% interest rate as x, we can write it as:

(\frac{6}{100} \times x)+(\frac{10}{100} \times [48000-x])=4000

0.06x+0.1(48000-x)=4000

0.06x+4800-0.1x=4000

0.1x-0.06x=4800-4000

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3 years ago
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N I think because u can tell
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I need this answer it’s all algebra (5a-4)-(8a+7b+8)
const2013 [10]

Answer:

-3a-7b-12

Step-by-step explanation:

(5a-4)-(8a+7b+8)

Distribute the minus sign

(5a-4)-8a-7b-8

Combine like terms

5a -8a  -7b -4-8

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