# Circles and Parallel Lines

Level pending

Let $$X\quad =\quad \left\{ { 3x+4y }|{ { x }^{ 2 } }+{ y }^{ 2 }=14x+6y+6 \right\}$$

If $$X\quad =\quad \left[ a,b \right]$$ , find $$b-a$$

• $$\left[ a,b \right]$$ denotes a closed interval
×