Let b=# of boys
Let g=# of girls
B+g=40
G=2b-5
Sub g into first equation and solve for b
B+2b-5=40
3b-5=40
3b=40+5
3b=45
B=45/3
B=15
Sub B into the second equation
G=2b-5
G=2(15)-5
G=30-5
G=25
Hope this helps!
Change in y over change in x
Step-by-step explanation:
To make this easier to understand lets make a table
<u> x | y </u>
1 | 2
2 | 4
3 | 6
Now we go back and find the slope. This is really simple as the rise and run is displayed.
- Count the change in x
In this case x changes by 1
2. Count the change in y
In this case it changes by 2
Now put it into rise over run
Rise(y)/Run(x)
your m or slope would be 2/1 or 2
and in a y=mx+b would be
y=2x+b
The function is f(x) = 9,000(0.95)x<span>
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