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2 years ago

Solve the following systems of equations. 2= 2y + 5 | 3y - 3x = -12

Mathematics

1 answer:

ivanzaharov [21]2 years ago

7 0

Answer:

x=5/2, y=-3/2. (5/2, -3/2).

Step-by-step explanation:

2=2y+5

3y-3x=-12

--------------

2-5=2y

2y=-3

y=-3/2

3(-3/2)-3x=-12

-9/2-3x=-12

3x=-9/2-(-12)

3x=-9/2+12

3x=-9/2+24/2

3x=15/2

x=(15/2)/3

x=(15/2)(1/3)

x=15/6=5/2

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Neil drives at an average speed of 60 miles/hour to reach his destination 480 miles away. On the way back, he decides to increas

daser333 [38]

Answer:

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Step-by-step explanation:

We can use the relations ...

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to write the required inequality any of several ways.

Since the problem is posed in terms of time (7 hours) and an increase in speed (x), we can write the time inequality as ...

480/(60+x) ≤ 7

Multiplying this by the denominator gives us a distance inequality:

7(60+x) ≥ 480 . . . . . . at his desired speed, Neil will go no less than 480 miles in 7 hours

Or, we can write an inequality for the increase in speed directly:

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2 years ago

Expand $\left(x^2 \frac{1}{x}\right)^3$. (Write the terms with higher degree first, so for example an $x^2$ term would come befo

Ilya [14]

Answer:

$x^6+3x^3+3+\dfrac{1}{x^3}$

Step-by-step explanation:

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2 years ago

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Irina18 [472]

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Step-by-step explanation:

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1 year ago

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Sati [7]

Answer:

$b=\frac{4c-a^{2} }{3}$

Step-by-step explanation:

First: multiply both sides by 4. 4 times c is 4c and the other sides cancels out as you are doing the inverse operation of division

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From that you get $4c-a^{2} =3b$

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2 years ago

What is the value of a in the equation 3a + b = 54, when b = 9?

nasty-shy [4]

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Hope this helps

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2 years ago