Is Half a mile in 30 seconds fast? Why?

1 answer:

5 0

There are 60 minutes in an hour and 60 seconds in a minute.

60 * 60 = 3600

There are 3600 seconds in an hour.

3600/30 = 120

3600 seconds is 120 times 30 seconds.

If you go 1/2 mile in 30 sec, you go 120 times more distance in 1 hour.

1/2 mile * 120 = 60 miles

1/2 mile in 30 sec is the same as 60 miles per hour.

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How do you solve this<br>y=-x-1<br>y=2x-6

Lerok [7]

Answer:

x = 5/3

y = -8/3

Step-by-step explanation:

To solve y = 2x - 6 substitute the y for -x - 1 and solve for x.

-x - 1 = 2x - 6 Now you can solve this like a regular inequality. Start by subtracting 2x on both sides.

-3x - 1 = -6 Now add 1 to both sides

-3x = -5 Divide by -3 on both sides

x = 5/3 (the negatives cancel and become positive)

Because you have x, you can go back and properly solve for y. Substitute x for 5/3

y = 2(5/3) - 6 Simplify the right side to get your answer.

y = 10/3 - 6 In order to subtract 6, you first have to convert it to a fraction with a denominator of 3. To do this, put 6 over 1 (6/1) then find the least common denominator of 3 and 1, which is 3. Now multiply 1 by 3 and 6 by 3 to get 18/3

y = 10/3 - 18/3

y = -8/3

I hope this helped :)

3 0

3 years ago

4x-8y=12<br>14+2x=-6y<br>plz help

sesenic [268]

Answer:

x=2.7142 y=-2.8571,

Step-by-step explanation:

given 4x-8y=12............(1)

14+2x=-6y