Subtracting the second equation by 18 on both sides, we have xy=-18. Next, we divide both sides by x to get y=-18/x Plugging that into the first equation, we have x+2(-18/x)=9. Multiplying both sides by x, we get x^2-36=9x. After that, we subtract both sides by 9x to get x^2-9x-36=0. Finding 2 numbers that add up to -9 but multiply to -36, we do a bit of guess and check to find the answers to be -12 and 3. Factoring it, we get
x^2-12x+3x-36=x(x-12)+3(x-12)=(x+3)(x-12). To find the x values, we have to find out when 0=(x+3)(x-12). This is simple as when you multiply 0 with anything, it is 0. Therefore, x=-3 and 12. Plugging those into x=-18/y, we get x=-18/y and by multiplying y to both sides, we get xy=-18 and then we can divide both sides by x to get -18/x=y. Plugging -3 in, we get -18/-3=6 and by plugging 12 in we get -18/12=-1.5. Therefore, our points are (-3,6) and (12, -1.5)
X= -5/8-5/8√33 or x= -5/8+5/8 √<span>33</span>
The answer is about 60ish. Hope this helped. :-)
<span>a) f(n) is the number of students in your calculus class whose birthday is on the nth day of the year.
f(n) is not invertible because several different days, n, may have the same number of students, f(n). Then for one specific f(n) you cannot determine a unique n.
b) f(x) is the volume in litters of x kilograms of water at 4 degrees celsius.?
f(x) is invertible because each x gives a different f(x), then you can determine unambiguously which f(x) corresponds to each x.
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No, that line will not be the correct line of best fit for the data set
Step-by-step explanation:
A positive correlation relationship means that both variables move in the same direction.
This means when one variable increases the other one also increases or one variable decreases as the other one decrease.
If value of r is 0.2-0.39 it is considered to be weak. Values of r 0.6 and above to 1.0 are considered to be strong.
However,these are all arbitrary limits thus context of the results should be considered.
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Correlation coefficient : brainly.com/question/10285237
Keywords : correlation, positive ,data
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