It's really just knowing how to use fractions.
Say you have 8 jelly beans in a baggie. 5 are yellow and 3 are green.
What is the likelihood of pulling a green one out? Not likely.
What is the likelihood of pulling out a white one out? Impossible.
Are you getting it? Or do you need more help? :)
We can use 3 facts:



So, to find our x and our y we can do:
So, now that we know our x and our y we can find our r.

You'll notice, though, that there were two solutions for
, which means we have a positive and a negative for our x. So:

6 is what you're dividing by so it goes on top as the numerator and x + y is the denominator: 
<u>Part A and its work</u>
There is an ratio relationship between the hours and the amount paid. So for every hour you get paid 15$, You can figure this out by dividing the table for each amount of money earned by the time.45/3=15
75/5=15
120/8=15
150/10=15
<u>Part B and Its work</u>
Carl earns more money then louis because louis only makes 12$ per hour, It can even be shown in the chart below
Money||Money Earned
3 || 36
5 || 60
8 || 96
10 || 120
<u>Part C</u>
Make A coordinate grid, the X axis as time and the Y axis as money earned and plot the following coordiates (0,0) (1,15) (2,30)