Mathematics: The sum of the speeds of two trains is 726.1 miles per hour. If the speed of the first train is 9.9 mph faster than that of the second train, find the speeds of each.

-2x + 5 - 8x + 12 + 3 (x - 4)= -10x + 17 + 3x - 12 = -7x + 5 ...simplifyanswer is TRUE...

The sum of the speeds of two trains is 726.1 miles

kylieweeks052704

28.01.2022

Train 1: 368 mph

Train 2: 358.1 mph

Step-by-step explanation:

We can write 2 equations to represent this problem.

x+y=726.1

x=9.9+y

The x represents the first train and the y represents the second train.

We can plug in x into the first equation.

(9.9+y)+y=726.1

9.9+2y=726.1

2y=716.2

y=358.1

Now that we know our y, we can find our x.

x=9.9+y

x=9.9+358.1

x=368

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