a tenth = 0.1 so 1/0.1 = 10 so 10 tenths in 1
a hundredth = .01 so 1/.01 = 100 so 100 hundredths in 1
by those 2 you can see that here would be 1000 thousandths and 10000 ten thousandths in 1
Y = -2/5x + 1
I think your question is what is the y-intercept? It would be 1. -2/5 is the slope.
I attached a photo of my work below; I just screenshotted the photo you provided. I apologize in advance for any mistakes, it’s 1 am and I’m in need of some sleep. However, I hope it helps otherwise. Have a good one!