Answer:
x=-2, y=5. (-2, 5).
Step-by-step explanation:
2x+9y=41
-4x+y=13
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2(2x+9y)=2(41)
-4x+y=13
-----------------------
4x+18y=82
-4x+y=13
------------------
19y=95
y=95/19
y=5
2x+9(5)=41
2x+45=41
2x=41-45
2x=-4
x=-4/2=-2
You need to complete the square in x and in y,

First, group the x-terms and the y-terms separately.

Move the 10 to the right side by subtracting 10 from both sides.

Now complete the square in x and in y.
The constant you need to add to complete each square is the square of half of the coefficient of the x or y term. Make sure to add the constants to both sides of the equation.

55/100 x 210 = 115.5kg were sold in a week
210-115.5=94.5kg left unsold
Answer:
C
Step-by-step explanation:
In a 45-45-90 triangle, two of the sides are congruent because the angles are congruent. Choice C is the only answer in which the sides are congruent.
32 -16 +8 -4 +2 -1 +0.5 -0.25
good luck