document.write( "Question 235857: Resolution \n" );
document.write( "(*) y= 2x-1 \n" );
document.write( "Attribute at least two values of x an get y values in oder to get two or more points to draw grah. \n" );
document.write( "example: \n" );
document.write( "for x=0; y=2*0-1 then y=-1 and we get the first point A(0,-1) \n" );
document.write( "for x=1; y=2*1-1 then y=1 and we get the second point B(1,1) \n" );
document.write( "We must materialize A and B then join A and B. that's all. \n" );
document.write( "for the second equation y= -3x +9 do the same thing: attribuate any values of x(at least two values) in oder to get y. \n" );
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