Based on the graph of the relationship given between time and the amount of popcorn popped, the relationship doesn't yield a straight line, hence, the relationship isn't proportional.
A proportional relationship is one in which there is a constant change in one variable as the value of the other variable is varied.
A proportional relationship will always yield a straight line with either a positive or negative slope.
Since, the trend line isn't straight, then the relationship isn't proportional.
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