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tatiyna
3 years ago
7

Solve the equation: x - 9 = -6 + 5 A. 21 B. 7 C. 14 D. 2

Mathematics
2 answers:
uysha [10]3 years ago
8 0

Answer:

I got 8, but I'm not sure.

Step-by-step explanation:

So I first did -6 + 5, and I got -1 as an answer. Then I did -1 plus 9 because both sides need to be equal. I wrote that x = 8 but that wasn't an option. I'm not sure if this was helpful and I'm really sorry if it's not.

kenny6666 [7]3 years ago
5 0

Answer:

The correct answer is 8. But in the option there is no option with answer 8

Step-by-step explanation:

The given expression is,

x - 9 = -6 + 5

RHS = -6 + 5  = -1

LHS = x -9

LHS = RHS

Therefore x - 9 = -1

x = -1 + 9 = 8

Therefore the correct answer is 8.

There is no option with correct answer. So we cant

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2 years ago
A riverboat travels 54 km downstream in 2 hours. It travels 57 km upstream in 3 hours. Find the speed of the boat and the speed
irakobra [83]

Here we must write and solve a system of equations to find the speed of the boat and the speed of the stream. We will find that the boat's speed is 23km/h and the river's speed is 4km/h.

First, remember the relation:

Distance = Speed*Time.

Now let's define the variables we will be using:

  • B = boat's speed
  • R = river's speed.

When the boat travels downstream, the total speed of the boat is the speed of the boat plus the speed of the river, and we know that in that case it travels 54km in 2 hours, then:

54km = (B + R)*2h

When the boat travels upstream, we must subtract the speed of the river. In that case, we know that the boat travels 57km in 3 hours, then we have:

57km = (B - R)*3h

Then our system of equations is:

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To solve this, first, we need to isolate one of the variables in one of the equations, let's isolate B in the second one:

57km = (B - R)*3h

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Now we can replace that in the other equation:

54km = (B + R)*2h

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Now we can solve this for R:

27 km/h = 19km/h + 2*R

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Now that we know the value of R, we can use:

B = 19 km/h + R  = 19 km/h + 4km/h = 23 km/h

So the boat's speed is 23km/h and the river's speed is 4km/h.

If you want to learn more, you can read:

brainly.com/question/12895249

5 0
2 years ago
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Step-by-step explanation:

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3 years ago
Select the THREE equations that this diagram could represent.
Vladimir [108]

<u>Question </u>

Select the three equations that this diagram could represent.

<u>                                                                                                                                     </u>

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<em>Well, we first have to find out what the diagram says.</em>

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