Question

Can someone please help me understand this?

Which line would the point (31, 36) fall upon? How do you know?

Answer 1

It would fall on the upper line.

Explanation:

I can look at each line and see the equation for each.

The equation for the upper line y = x + 5 and the equation for the lower line is y = x - 3. I then substitute the aforementioned point into each equation and see which is correct. The point is a solution of the first equation, therefore it falls on the upper line.