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label Algebra
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Apr 8th, 2015

All four of these lines intersect at one point.  According to the graph, all points intersect at (0,3) where the x coordinate is zero and y is the point where all 4 lines intersect (y=3) because if you put x=0, the y coordinate for all four equations will be 3.  So point (0,3) is where all four lines intersect.

The numbers in front of each of the "x"s, (2, 4, -2, -4) are the SLOPES.  If the number in front of the x is positive, it has a positive slope (line is inclining, going up), if the number in front of the x is negative, then it has a negative slope (line is declining, going down).

Remember line equation is:

y = mx + b, where m=slope, b=constant, x=x coordinate, y= answer you get when you plug in x coordinate.

Let me know if you have any more questions about this. 

Apr 8th, 2015

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