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Introduction: Systems of Linear Equations - Part 1

10Two lines - one common point

Graphical peculiarity

Image

The intersection point lies on both straight lines.

For the xx-value of the intersection point, both lines provide the same yy-value.

Computational peculiarity

At the intersection point both equations of the equation system are fulfilled!

So if you plug the intersection point into both equations, you get the same, true statement!

Intersection point: P  (13)\ P \; (\color{#cc0000}{1}|\color{#009999}{3})

Line g:

y=22x+92y=-\frac{2}{2}x + \frac{9}{2}

3=321+92\color{#CC0000}{3}=-\frac{3}{2}\cdot \color{#009999}{1} + \frac{9}{2}

3=3\color{#CC0000}{3}=3

Line h:

y=2x+1y=2x +1

3=21+1\color{#CC0000}3=2\cdot \color{#009999}{1} +1

3=3\color{#CC0000}{3}=3


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