Solve the Problem $$\left\{ \begin{array} { l } - 7 x + 9 y = - 21 \\- 4 x - 2 y = - 12\end{array} \right.$$

question 24

Multiple Choice

Solve the problem.
- $$\left\{ \begin{array} { l } - 7 x + 9 y = - 21 \\- 4 x - 2 y = - 12\end{array} \right.$$

• A) \(\{ ( 2,1 ) \}\)
• B) \(\{ ( 3,0 ) \}\)
• C) no solution; \(\varnothing\)
• D) \(\{ ( 3,1 ) \}\)

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Definitions:

MAPE

Mean Absolute Percentage Error, a measure used to assess the accuracy of forecast models by calculating the average absolute percent error between predicted and observed values.

Exponential Smoothing

A forecasting technique that applies decreasing weights to past observations as they become older to predict future values.

Trend Adjustment

A statistical technique used to remove effects of trends in time series data, allowing for better analysis and forecasting of the underlying patterns.

Smoothing Constants

Parameters used in exponential smoothing models to control the rate at which past observations are decayed or discounted.