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3 years ago

2x + 3y = 12 4x - 3y = 6

Mathematics

2 answers:

lana66690 [7]3 years ago

6 0

Answer:

x=3 , y=2

Step-by-step explanation:

2x + 3y = 12

4x - 3y = 6

+_________

2x + 4x + 3y - 3y = 12 + 6

6x = 18

x = 18/6

x = 3

Now, we can find ''y'' :

4x - 3y = 6

plug in 3 for ''x'' then find y

4.3 - 3y = 6

12 - 3y = 6

3y = 6

y = 2

Hope this helps ^-^

8_murik_8 [283]3 years ago

3 0

So the value of X is 3 and y is 2.

Look at the attached picture

Hope it will help you...

<h2>FOLLOW ME FOR MORE.</h2>

<h3>-pragya~~</h3>

 

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3 years ago

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Answer:

1.72 hours on the train.

Step-by-step explanation:

The distance between the two cities is 220 miles. Therefore the sum of the bus and train distances is 220 miles. Let x be the distance by train and y the distance by bus: x + y = 220

Bus speed was 30 mph and train speed was 85 mph. The whole trip was 5 1/2 hours, that is 5.5 hours.

We have to, the bus distance would be equal to:

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speed equals distance over time, like so:

v = d / t; if we rearrange for time

t = d / v, we can do another equality, since we know that the total time is 5.5 hours

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(30 * x + 85 * 260 - 85x) / 85 * 30 = 5.5

Solving:

-55 * = 2550 * 5.5 - 22100

x = 146.81

146.81 miles would be the train distance.

To find the time, we divide by the speed of the train which is 85 mph:

146.81 / 85 = 1.72 h

We buy, with the equation the time:

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3 years ago

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3 years ago

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3 years ago