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yuradex [85]
3 years ago
13

Help me please...

Mathematics
1 answer:
seropon [69]3 years ago
6 0
We have that

x²+y²-4x-6y-12=0
Group terms that contain the same variable, and move the constant to the opposite side of the equation
(x²-4x)+(y²-6y)=12
Complete the square twice. Remember to balance the equation by adding the same constants to each side
(x²-4x+4)+(y²-6y+9)=12+4+9
Rewrite as perfect squares
(x-2)²+(y-3)²=25
the answer part A) is 
(x-2)²+(y-3)²=5²-----> this is the standard form of the equation of a circle

Part B) (x-2)²+(y-3)²=5²
the center is the point (2,3) and the radius is r=5 units


Part C) 
using a graph tool
see the attached figure

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Name the sets of numbers to which -7/9 belongs
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Ok
the sets are
natural numbers (or counting numbers), this is like 1,2,3,4,5 etc

whole numbers, this is including 0, so 0,1,2,3,4,5,6 etc

integers, this includes the previoius set and negatives, so -3,-2,-1,0,1,2,3,4,5 etc

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-7/9 goes in the rational set

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