The slope of any line passing through (0, 0) can be seen as [i][b]y[/b]/[b]x[/b][/i]. Any part/whole fraction can be represented as a slope ratio with the numerator = [i][b]y[/b][/i] and the denominator = [i][b]x[/b][/i].[br][br]Use the slider on the [i][b]x[/b][/i]-axis to determine the whole, and the slider on the [i][b]y[/b][/i]-axis to represent the part in a fraction (i.e., [i][b]y[/b]/[b]x[/b][/i]). Similarly, a ratio of [i][b]a[/b][/i] : [i][b]b[/b][/i] can be represented as [i][b]a[/b]/[b]b[/b][/i] using the slider on the [i][b]y[/b][/i]-axis for [i][b]a[/b][/i] and the slider on the [i][b]x[/b][/i]-axis for [i][b]b[/b][/i].[br][br]The ratio of [i][b]y[/b]/[b]x[/b][/i] is proportional to the percent value (i.e., [i][b][color=#ff0000]p[/color][/b][/i]/100). So, for example, a ratio of 10/40 can be seen as equivalent to [color=#ff0000]25[/color]/100, which is [color=#ff0000]25[/color]%.[br][br]The ratio of the unit rate (i.e., [i][b]r[/b]/[/i]1) is also proportional to any ratio expressed as [i][b]y[/b]/[b]x[/b][/i]. So, a ratio of 10/40 has a unit rate of 1/4 : 1, or 0.25.