Line [math]a[/math] and Line [math]c[/math] are parallel lines. They have the same slope.[br][br][math]y=mx+b[/math] is the slope-intercept form of a linear equation.[br]The slope is [math]m[/math].[br][br]Move slider [math]m[/math]. The slope for both lines will change. [br][br]Move slider [math]b[/math]. Line [math]a[/math] will move, but line [math]c[/math] will be stationary.