In rectangle ABCD, P is the center point of DC. Q is a moving point on AB (doesn't overlap with A or B). If the length of AQ is x and the sum of QM and QN is y, choose the graph below that best describes the relationship between x and y.

ooojustwhy Mar 18, 2018

#1**+2 **

**In rectangle ABCD, P is the center point of DC. Q is a moving point on AB (doesn't overlap with A or B). **

**If the length of AQ is x and the sum of QM and QN is y, **

**choose the graph below that best describes the relationship between x and y.**

\(\text{Let $\angle A =\angle\ PAB = \angle\ PBA $ } \\ \text{Let $AQ = x $ } \\ \text{Let $QM + QN = y $ } \)

\(\begin{array}{|rcl|rcl|} \hline \sin(A) &=& \dfrac{QM}{x} & \sin(A) &=& \dfrac{QN}{AB-x} \\ \hline \end{array} \\ \begin{array}{|rcll|} \hline y(x) &=& QM + QN \\ &=& x \sin(A) + (AB-x) \sin(A) \\ &=& \sin(A) ( x + AB-x) \\ &=& AB\sin(A) \quad & \quad \text{y is constant} \\ \hline \end{array}\)

**D.**

heureka Mar 19, 2018