Question

So i'm having a bit of trouble with the same thing again, sorry for asking this many questions for the same lesson but my moms bf who passed and was top in his calculus classes didn't even understand it! Shocker huh? anyways here's the question;
y=9x
6x-y=-1

Answer 1

I'm not sure I understand the question. But if I do understand it, it should be x=1/3