Question

This is really confusing... making my head hurt. I don't understand it AT ALL. If I get this one wrong, and all the other three like this, I'm gonna fail my test.
Can you figure out number 8 please and show how you got it?

Answer 1

Number 7 is a because line m crosses at 2 on the y axis and number 8 is a because it goes up by one half each time