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4 years ago

Can someone please help me with this? will give you brainiest if correct

Mathematics

1 answer:

Rom4ik [11]4 years ago

7 0

Answer: The solution is [2, 1]

Step-by-step explanation:

The given system of simultaneous equations is expressed as

7x - 6y = - 20 - - - - - - - - - - 1

3x + 5y = - 1 - - - - - - - - - - - - -2

We would eliminate x by multiplying equation 1 by 3 and equation 2 by 7. It becomes

21x - 18y = - 60 - - - - - - - - - - 3

21x + 35y = - 7 - - - - - - - - - - 4

Subtracting equation 4 from equation 3, it becomes

- 53y = - 53

Dividing the left hand side and the right hand side of the equation by - 53, it becomes

- 53y/ - 53 = - 53/ - 53

y = 1

Substituting y = 1 into equation 2, it becomes

3x + 5 × 1 = - 1

3x + 5 = - 1

Subtracting 5 from the left hand side and the right hand side of the equation, it becomes

3x + 5 - 5 = - 1 - 5

3x = - 6

Dividing the left hand side and the right hand side of the equation by 3, it becomes

3x/3 = - 6/3

x = 2

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Tara made 9 identical bags using 2 yards of fabric. How much fabric did Tara use for each bag?

SashulF [63]

Answer she used 4.5 for each bag.

Step-by-step explanation:

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3 years ago

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I keep getting this wrong and I only have one chance to get it right. Please help! It's timed aswell.

allsm [11]

PIC 1 - floor function

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3 years ago

(03.04 MC)

mr Goodwill [35]

Answer:

Step-by-step explanation:

The middle one is the average of the three numbers, so is 84/3 = 28. Since the numbers are consecutive, the largest is 1 more than this: 29.

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3 years ago

If p = the moutain bike's original price in dollars,

aleksandr82 [10.1K]

If p = the mountains bike's original price in dollars that means p is the value in dollars of the price of the bike.

Comment down if you require any more help on this specific question...

6 0

3 years ago

Can someone help me the 2nd problem I don’t understand it

Galina-37 [17]

Answer:

So this means the bus B covered 390-120=270 miles when bus A has already reached 390 miles.

270 miles

Step-by-step explanation:

So is A is going faster than B so A will reach the destination first.

When will A reach it's destination?

Let's find out.

To solve this problem, the following will come in handy:

Speed=distance/time or time*Speed=distance or time=distance/speed .

time=distance/speed

$T_A=\frac{390}{S_A}$

$T_A=\frac{390}{65}$

$T_A=6$

So it will take bus A 6 hours to cover the distance of 390 miles.

How much time would have it taken bus B to reach that same distance?

$T_B=\frac{390}{45}$

$T_B=8.\overline{6}$

So it would have taken bus B $8.\overline{6}$ hours to cover a distance of 390 miles.

So the time difference is $8.\overline{6}-6=2.\overline{6}$ hours.

It will take $2.\overline{6}$ more hours than bus A for bus B to complete a distance of 390 miles.

So bus B traveled $2.\overline{6} \cdot 45=120$ miles (used the time*speed=distance) after bus A got to it's destination.

So this means the bus B covered 390-120=270 miles when bus A has already reached 390 miles.

4 0

4 years ago