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8.1.5 Quiz: Populations and Samples
Question 5 of 5
2 Points
The director of Washington County Animal Services wants
to learn more about the adoptable pets in local animal
shelters.
Which of these methods will produce the most representative sample of the
population of adoptable pets at shelters in Washington County?
O
A. The director evaluates all adoptable rabbits at area shelters.
B. The director evaluates every adoptable pet at one selected shelter.
O
C. The director selects adoptable pet ID numbers at random from
each shelter.
D. The director visits each shelter and evaluates the first 10 cats in
each place.

Ok here we go ..there are plenty of ways to solve such math problems but we will go for the smartest and easiest ..5x+2y=7  -2x+6y=9we rearrange them into the following ..by multiplying the 1st equation by 2 it becomes 10x + 4y = 14we rearrange it and so it becomes 10x = 14 - 4yas for the second equation we multiply it by 5 and rearrange it so it becomes as to the following ..-10x + 30y = 45rearranging so 10x = 30y -45now 10x equals both 14 - 4y and 30y -45so   14 - 4y = 30y -4531 = 26yy= 31/26 = 1.19 or around 1.2so by now we can calculate x easily as  -2x+6y=9so 2x = 6y -9 = 6 * 31/26 - 9 = -1.84  then x = - 0.92 or around -0.9best luck!