Solve the system of linear equations by graphing. 
Definitions:
Standard Error
The typical deviation within the distribution of samples for a statistic, often specifically of the mean.
Standard Deviation
An indicator of the variability within a set of data points, reflecting how much individual points differ from the average.
Population Mean
The total sum of all the values in a population divided by the number of values in that population, serving as a measure of central tendency.
Point Estimate
A single value given as an estimate of a population parameter derived from a sample.
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