When one variable is proportional to some constant times the other variable, this is known as direct linear variation. Why linear? Because the highest power of the variable being multiplied by the proportionality constant is 1. This means that graphs of a direct linear relationship have these characteristics:
· The line is a straight one
· This straight line always passes through the origin of the graph (the 0, 0 point where the axes usually intersect)
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Answer:
When one variable is proportional to some constant times the other variable, this is known as direct linear variation. Why linear? Because the highest power of the variable being multiplied by the proportionality constant is 1. This means that graphs of a direct linear relationship have these characteristics:
· The line is a straight one
· This straight line always passes through the origin of the graph (the 0, 0 point where the axes usually intersect)