Which of the following has a constant of proportionality of 2?
2 answers:
Answer : y= 2x
When y is directly proportional to x then
y = kx where k is the constant of proportionality.
y = 2x , the value of k is 2. so 2 is the constant of proportionality.
y = x + 2, the equation is not in the form of y=kx
2y = x , so constant of proportionality k is
y + 2 = 2x , y = 2x -2 is not in the form of y=kx
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Answer:
Step-by-step explanation:
In 5 liters, there is 4% salt.
Lets find liters of salt.
First, converting 4% to decimal (dividing by 100):
4% = 4/100 = 0.04
0.04 * 5 = 0.2
So, there is 0.2 liters of salt.
Now, x liters of water is added to total, so total is now:
5 + x
The concentration of salt will be amount of salt divided by amount of salt water solution.
Amount of salt = 0.2 (as seen above)
Amount of new salt water solution = x + 5
So,
Concentration of salt in new solution is
2nd choice is right.