M = (x₁ + x₂)/2 , (y₁ + y₂)/2
(-1, 2) =
At this point, it is easier to separate the x's and y's into two different equations:
x's: -1 =
-2 = 3 + x
-5 = x
y's: 2 =
4 = 4 + x
0 = x
Answer: (-5, 0)
IN A CLASS OF 30 STUDENTS 13 OF THEM ARE BOYS WHAT PERCENTAGE ARE GIRLS?
1 answer:
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Now, for z to be an integer, the sum x+y must be a divisor of 10.
It has to be a positive divisor since z≥0. Also x≠y.
x≥0 and y≥0 so y can be equal to either 0 or 1. There are 2 solution in this case.
In this case, y can be equal to 0,1, or 2, but for y=1 ⇒ x=1, so there are two solutions.
y can be 0,1,2,3,4 or 5 - 6 solutions
y can be 0,1,2,3,4,5,6,7,8,9,10, but for y=5 ⇒ x=5, so 10 solutions.
2+2+6+10=20 solutions in total.