Which line is perpendicular to y=5/8x+8

Question

jdoe0001 · Answer

say   what's the slope of  "  y=5/8x+8  "  anyway?

anonymous · Answer

I have no idea

anonymous · Answer

It just gives me four answers to choose from

jdoe0001 · Answer

well... have you covered slopes yet?

anonymous · Answer

Yes, I am in a college algebra class and I suck really bad at algebra. We did slopes and the lines last week and I didn't understand it then.

jdoe0001 · Answer

well for this case $\bf y={\color{purple}{ \cfrac{5}{8}}}x+8$    see the slope now?

anonymous · Answer

Yes, I see the slope now.

jdoe0001 · Answer

well.. a line that's perpendicular to that one, will have a NEGATIVE RECIPROCAL  slope
so  $\bf {\color{purple}{ \cfrac{5}{8}}}\qquad negative\implies -{\color{purple}{ \cfrac{5}{8}}}\qquad reciprocal\implies -{\color{purple}{ \cfrac{8}{5}}}$

jdoe0001 · Answer

so one with that slope is, perpendicular to the line of that equation

anonymous · Answer

ok.... I think I see what you are talking about. and you had to flip it to get it's reciprocal.

jdoe0001 · Answer

yeap

anonymous · Answer

Thank you very much.