Question

reflect the vector $\langle - 11,4\
angle$ across the y - axis. $\langle?,\
angle$

Explanation:

Step1: Recall the reflection rule

When reflecting a vector \(\langle x,y
angle\) across the \(y\)-axis, the rule is \(\langle x,y
angle\to\langle -x,y
angle\).

Step2: Apply the rule to the given vector

For the vector \(\langle - 11,4
angle\), substitute \(x=-11\) and \(y = 4\) into the rule \(\langle -x,y
angle\).
We get \(\langle-(-11),4
angle=\langle11,4
angle\).

Answer:

\(\langle11,4
angle\)