Need help with 49 and please explain

Umm:

Step-by-step explanation:

So C is correct but the solution wasn't because x and y both don't equal to 1. Here is the way to do it:

We work first on the second equation.

Combine the two terms:

Since we know

We can replace it:

We can then solve that y = 2/3.

Then, we can plug this value back into the equation

and get x = 3/2.

So, 2x + 3y does equal 5 but this is how you get there.

Step-by-step explanation:

A. d = r/t

    r = dt

B. distance = rate/time

800,000/4 = 200000

r = dt

200,000(4) = 800,000

C. 800/4 = 200

This is because kilo means 1000

D. It is easier to use kilometers because when using bigger numbers it is easier to simplify into smaller numbers with bigger units.