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2 years ago

What is the result of subtracting the second equation from the first ? -7x-y=0 and 7x+8y=-6

Mathematics

1 answer:

hoa [83]2 years ago

5 0

Answer:

- 14x - 9y = 6

Step-by-step explanation:

- 7x - y = 0 → (1)

7x + 8y = - 6 → (2)

Subtracting (2) from (1) term by term

- 7x - 7x - y - 8y = 0 - (- 6)

- 14x - 9y = 0 + 6

- 14x - 9y = 6

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A triangle with an area of 23 cm² is dilated by a factor of 6.

Jlenok [28]

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3 years ago

Expreess 3.81 as a mixed number

Luba_88 [7]

Answer:

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Step-by-step explanation:

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3 years ago

Train X is traveling at a constant speed of 30 miles per hour and Train Y is traveling at a constant speed of 40 miles per hour.

topjm [15]

Answer:

3.5 hours

Step-by-step explanation:

Speed of train X=30 mph

Speed of train Y=40 mph

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We know that

Time= $\frac{Distance}{Relative\;speed}$

Using the formula

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Time= $\frac{35}{10}=3.5 hours$

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3 years ago

Read 2 more answers

The cost, in millions of dollars, for a company to manufacture x thousand speed boats is given by the function C(x) = 3x2 - 30x

nalin [4]

Answer:

5000

Step-by-step explanation:

In vertex form, the cost function is ...

C(x) = 3(x² -10x) +175 = 3(x² -10x +25) +175 -3(25)

C(x) = 3(x -5)² +100

The vertex is at x=5, so the cost function will be minimized when 5000 speed boats are produced.

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3 years ago

Number 15 please help

OverLord2011 [107]

I would believe its 10

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3 years ago