Answer:
Step-by-step explanation:
Given the following system of equations:
In order to solve the System of equations, you can use the Substitution method. The steps are:
1. You can solve for "x" from the second equation:
2. Substitute the equation obtained into the first original equation:
3. Now you must solve for "y":
4. Substitute the value of "y" into the equation and evaluate:
Then, the solution is:
Answer:
or 0.2 or 20%
Step-by-step explanation:
For only two tests to be needed this means that the first test would need to come back as negative and the second test would be to come back as positive. Therefore, to find the probability of this happening we first need to find the probability of each individual test and multiply them together.
The first test needs to come back negative, there are four negative individuals out of the total 5 that are in the group. Therefore, the probability of the first test is 4/5.
Now we remove the individual that has just been tested and we are left with 4 total subjects in the group, of which only 1 is positive. Therefore, the probability of the second test is 1/4. Now we need to multiply these two probabilities together to get the probability of only needing two tests.
or 0.2 or 20%