Heyyy! The answer should be x=5-y
1. Well, we know it cannot be either the last or second to last answer as the original amount of pollutant (when x=0) is 10 tons.
After 1 foot of pipe 8 tons of pollutant are left (x=1). 8 tons is 80% of the original amount of the pollutant present. So, each foot of pipe keeps 80% of the pollutant. Make sense?
2. Just plug in the point into each answer choice.
(2,4)
y= 0.5x+ 5
4=0.5(2)+5
4=6
which is not true therefore the first answer choice is incorrect.
y=0.5x -3
4=0.5(2)-3
4=1-3
4=2
which is not true therefore the first answer choice is incorrect.
y=0.5x-5
4=0.5(2)-5
4=-4
which is not true therefore the first answer choice is incorrect.
y=0.5x +3
4=0.5(2)+3
4=1+3
4=4
This is the correct answer.
Answer:
4.53
Step-by-step explanation:
Divide the percentage by 100 to change it to a decimal.
If 2x+y=5, then y=5-2x, so he substituted 5-2x correctly.
x+4x=5x, so he combined like terms correctly.
If 5x-10=10, then 5x=10+10 -> 5x=20, so he subtracted 10 from the right side instead of adding 10 to the right side.
The answer is C.
Here's the correct solution:
Answer:
No
Step-by-step explanation:
The ratio of 2 : 5 would be 2/5 or .4
The ratio of 5 : 2 would be 5/2 or 2.5
These are not equal.
