Answer:
5x − 4 = 3x + 8
5x - 4 <em>+ 4</em> = 3x + 8 <em>+ 4</em>
5x = 3x + 12
5x <em>- 3x</em> = 3x + 12 <em>- 3x</em>
2x = 12
2x <em>/ 2</em> = 12 <em>/ 2</em>
x = 6
He earns $0.15 every minute. There are 60 minutes every hour and you are trying to found out how much money he is making in 1 minute, so you divide 9 by 60, which will give you the decimal number 0.15. The $29.25 was just a little extra information to try to brush you off.
The distance between 4 and -3 is 7
8km - 24 minutes, to find the unit rate (how long it took to run 1km)
We would make a ratio,
8:24
Now just simplify,
8:24
=
1:3
Therefore the unit rate would be 1 kilometer covered for every 3 minutes.