I think is A ,it's true use a calculator!
Answer:
Perpendicular lines
Step-by-step explanation:
MN: (-4, 8) and (-4, -6), This line parallel to y-axis as as x-value doesn't change
KL: (-8, 2) and (6, 2), This line is parallel to x-axis as y-value doesn't change
The given lines are perpendicular as one is parallel to x, another one is parallel to y
To model this situation, we are going to use the standard linear function:
![y=mx+b](https://tex.z-dn.net/?f=y%3Dmx%2Bb)
.
1. Since S represent the total amount of money in the savings account,
![y=S](https://tex.z-dn.net/?f=y%3DS)
. We also know that each week she adds $40 to her account, so the slope of our linear equation will be
![40W](https://tex.z-dn.net/?f=40W)
; therefore,
![m=40W](https://tex.z-dn.net/?f=m%3D40W)
. Since she started her account with $750,
![b=750](https://tex.z-dn.net/?f=b%3D750)
.
Lets replace those values in our linear function:
![y=mx+b](https://tex.z-dn.net/?f=y%3Dmx%2Bb)
We can conclude that equation that models this situation is:
2. Now to find the total amount after 16 weeks, we just need to replace
![W](https://tex.z-dn.net/?f=W)
with 16 in our equation and simplify:
![S=40(16)+750](https://tex.z-dn.net/?f=S%3D40%2816%29%2B750)
![S=640+750](https://tex.z-dn.net/?f=S%3D640%2B750)
We can conclude that the amount of money in her account after 16 weeks is $1390
The answer is C. m+n=54
m=3n+S.