Question

Use the diagram to determine the length of LJ

Answer 1

$\qquad\qquad\huge\underline{{\sf Answer}}$

Let's use distance formula ~

$\qquad \tt \dashrightarrow \:LJ = \sqrt{(x1 - x1) {}^{2} + (y2 - y1) {}^{2} }$

$\qquad \tt \dashrightarrow \:LJ = \sqrt{(0) {}^{2} + (y2 - y1) {}^{2} }$

$\qquad \tt \dashrightarrow \:LJ = \sqrt{ {}^{}(y2 - y1) {}^{2} }$

$\qquad \tt \dashrightarrow \:LJ = { {}^{}y2 - y1 {}^{} }$

I hope it was easy enough to understand, ask me if you have any doubts ~