[color=#980000][b]Questions: [/b][/color][br][br][color=#000000]1) What causes a line to have [/color][b]POSITIVE[/b][color=#000000] slope? Explain as best as you can.[/color][br][color=#000000]2) What causes a line to have [/color][b]NEGATIVE[/b][color=#000000] slope? Explain as best as you can. [/color][br][color=#000000]3) What causes a line to have [/color][b]ZERO[/b][color=#000000] slope? Explain as best as you can.[/color][br][color=#000000]4) What causes the slope of a line to be [/color][b]UNDEFINED[/b][color=#000000]? Explain as best as you can. [/color]