denominator
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the first and fourth terms of a proportion are called the means ?
When both can multiply its comparisons to when both ratios share the exact same numbers.
Assuming both the scales on the graph are linear (that is to say that the numbers go up evenly) then YES, a graph which shows direct proportion must be a straight line. It must also pass through the origin (0,0). A straight line which does not pass through the origin is NOT showing direct proportion. Duncan
The sum of the first 30 positive even numbers is 930.
3.141592653589793238462643