-2x + 5 = -1
subtract 5 from both sides: -2x = -6
divide each side by -2: x = 3
plug in 3: 5(3)
multiply: 15
the value of 5x is 15.
7c + 12 = -4c + 78
+4c. +4c
11c + 12 = 78
-12. -12
11c = 66
11/11. 66/11
C = 6
Plug in the answer to check .
7 * 6 + 12 = 54
-4 * 6 + 78 = 54
54 = 54
Answer:
The average rate of change is -3
Step-by-step explanation:
we have
![f(x)=-3x+1](https://tex.z-dn.net/?f=f%28x%29%3D-3x%2B1)
This is a linear function in slope intercept form ![f(x)=mx+b](https://tex.z-dn.net/?f=f%28x%29%3Dmx%2Bb)
where
m is the slope
b is the y-intercept
In this problem
The slope is equal to
![m=-3](https://tex.z-dn.net/?f=m%3D-3)
Remember that
In a linear function the average rate of chance is a constant and is equal to the slope of the linear function in any interval
therefore
The average rate of change is -3
It would be the 2nd option. 1976.25 is the answer using the below calculations.
How?
57.25 total hours... break it down
40*$30= $1200
Plus
17.25 *($30*1.5) ... or 17.25*$45=$776.25
$1200+$776.25=$1976.25