We have such equation
5x-3y=12 /-5x (subtract 5x both sides)
5x-5x-3y=12-5x
-3y=-5x+12 /:3 divide both sides by 3
-y=
![\frac{-5x+12}{3}](https://tex.z-dn.net/?f=%20%5Cfrac%7B-5x%2B12%7D%7B3%7D%20)
/*(-1) multiply both sides by -1
y=-
![\frac{-5x+12}{3}](https://tex.z-dn.net/?f=%20%5Cfrac%7B-5x%2B12%7D%7B3%7D%20)
y=
![\frac{5x-12}{3}](https://tex.z-dn.net/?f=%20%5Cfrac%7B5x-12%7D%7B3%7D%20)
- its the answer
Answer:
y = -1/2x + 7/2
Step-by-step explanation:
The 50th percentile is the median so the z score will be 0
B.$84
I did this with cross multiplication.
![\frac{x}{240} \times \frac{35}{100}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bx%7D%7B240%7D%20%20%5Ctimes%20%20%5Cfrac%7B35%7D%7B100%7D%20)
The fraction on the right is 35% over 100%. the 35% represents the percentage the 6th graders raised of the total money raised.
The fraction on the left is x (representing how many dollars the 6th graders raised, what we're trying to find) over $240, the total amount raised by the school.
1. cross multiply 35 with 240.
35x240=8400
2. Since we are looking for x and 100 is across from it you divide what you got from the first multiplication by 100
8400/100=(100*x)/100
=$84