Graphing and the straight line

"To introduce slope, Ron Lancaster uses a graph to plot two series of values, the first representing different antifreeze solutions and the second representing freezing points. He difines rise and run and calculates slope from these two sets of values. he also talks about how slope is used in building trades."@en
"To introduce slope, Ron Lancaster uses a graph to plot two series of values, the first representing different antifreeze solutions and the second representing freezing points. He difines rise and run and calculates slope from these two sets of values. he also talks about how slope is used in building trades."
"Ron Lancaster uses a graph to plot two series of values, the first representing different antifreeze solutions and the second representing freezing points."@en