Write the System of Linear Equations as a Matrix Equation,AX $$\left\{ \begin{array} { r } - x _ { 1 } + x _ { 2 } = 8 \\- 4 x _ { 1 } + x _ { 2 } = 0\end{array} \right.$$

question 56

Multiple Choice

Write the system of linear equations as a matrix equation,AX = B.​ $$\left\{ \begin{array} { r } - x _ { 1 } + x _ { 2 } = 8 \\- 4 x _ { 1 } + x _ { 2 } = 0\end{array} \right.$$ ​

• A) \[\left[ \begin{array} { l l }
• - 1 & 1 \\
• - 4 & 1
• \end{array} \right] \left[ \begin{array} { l }
• x _ { 1 } \\
• x _ { 2 }
• \end{array} \right] = \left[ \begin{array} { l }
• 8 \\
• 0
• \end{array} \right]\]
• B) \[\left[ \begin{array} { c c }
• 1 & 1 \\
• - 4 & - 1
• \end{array} \right] \left[ \begin{array} { l }
• x _ { 1 } \\
• x _ { 2 }
• \end{array} \right] = \left[ \begin{array} { l }
• 8 \\
• 0
• \end{array} \right]\]
• C) \[\left[ \begin{array} { l l }
• - 1 & 1 \\
• - 4 & 1
• \end{array} \right] \left[ \begin{array} { c }
• - x _ { 1 } \\
• - x _ { 2 }
• \end{array} \right] = \left[ \begin{array} { l }
• 8 \\
• 0
• \end{array} \right]\]
• D) \[\left[ \begin{array} { l l }
• - 1 & - 1 \\
• - 4 & - 1
• \end{array} \right] \left[ \begin{array} { l }
• x _ { 1 } \\
• x _ { 2 }
• \end{array} \right] = \left[ \begin{array} { l }
• 8 \\
• 0
• \end{array} \right]\]
• E) \[\left[ \begin{array} { l l }
• 1 & 1 \\
• 4 & 1
• \end{array} \right] \left[ \begin{array} { l }
• x _ { 1 } \\
• x _ { 2 }
• \end{array} \right] = \left[ \begin{array} { l }
• 8 \\
• 0
• \end{array} \right]\]

Recognize the impact of policies, interpersonal relationships, and environmental factors on health.

Understand the challenges and strategies in modifying risk factors and promoting physical activity.

Comprehend the definitions and assessments of health and health behaviors.

Understand the role of environmental and societal factors in promoting a healthy lifestyle.

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Definitions:

Neurotransmitters

Chemical messengers that transmit signals across the synaptic gap from one neuron to another in the nervous system.

Synaptic Gap

The tiny space between neurons where neurotransmitters are released to transmit information.

Molecules

The smallest unit of a chemical compound that can exist, consisting of two or more atoms held together by chemical bonds.

Refractory Period

A period immediately following an action (e.g., a neuron's firing or human ejaculation) during which a second action is difficult or impossible to initiate.