# Coordinates

Determine the coordinates of the vertices and the content of the parallelogram, the two sides of which lie on the lines 8x + 3y + 1 = 0, 2x + y-1 = 0 and the diagonal on the line 3x + 2y + 3 = 0

Correct result:

x0 =  -2
y0 =  5
x1 =  1
y1 =  -3
x2 =  5
y2 =  -9
x3 =  8
y3 =  -17
S =  14

#### Solution:

8x0+3y0+1=0
2x0+y0-1=0

8•x0+3•y0+1=0
2•x0+y0-1=0

8x0+3y0 = -1
2x0+y0 = 1

x0 = -2
y0 = 5

Our linear equations calculator calculates it.

8x1+3y1+1=0
3x1+ 2y1+3=0

8•x1+3•y1+1=0
3•x1+ 2•y1+3=0

8x1+3y1 = -1
3x1+2y1 = -3

x1 = 1
y1 = -3

Our linear equations calculator calculates it.

2x2+y2-1=0
3x2+ 2y2+3=0

2•x2+y2-1=0
3•x2+ 2•y2+3=0

2x2+y2 = 1
3x2+2y2 = -3

x2 = 5
y2 = -9

Our linear equations calculator calculates it.
$x=\dfrac{ x_{2}+x_{1} }{ 2 }=\dfrac{ 5+1 }{ 2 }=3 \ \\ y=\dfrac{ y_{2}+y_{1} }{ 2 }=\dfrac{ (-9)+(-3) }{ 2 }=-6 \ \\ \ \\ x_{3}=-x_{0}+2 \cdot \ x=-(-2)+2 \cdot \ 3=8$
$y_{3}=-y_{0}+2 \cdot \ y=-5+2 \cdot \ (-6)=-17$

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