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Graphing a system of equations on the same set of axes

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Zelda Luxenburry
Zelda Luxenburry 2011-6-27
Here is my question to solve: Graph the following system on the same set of axes.
{y=(-2/3)*x + 4/3 {y= -(x^2)/3 + 3 {y= 2*x +9
Any suggestions are welcome!

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Matt Fig
Matt Fig 2011-6-27
x = -10:.1:10;
y1 =(-2/3)*x + 4/3;
y2 = -(x.^2)/3 + 3;
y3 = 2*x +9;
plot(x,y1,'b',x,y2,'r',x,y3,'k')

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