When Yoshi graphed the lines $y=2x+3$ and $y=2x−2$, she got the graph shown at right.  

1. One of the lines at right matches the equation $y=2x+3$, and the other matches $y=2x−2$. Which line matches which equation?

   Hint (a):

   Look at the $y$-intercepts, otherwise known as the $b$ in
   $y=mx+b$, to decide which line goes with which equation.

   Answer (a):

   line $a$: $y=2x−2$, line $b$: $y=2x+3$

2. Yoshi wants to add the line $y=2x+1$ to her graph. Predict where it would lie and sketch a graph to show its position. Justify your prediction.

   Hint (b), (c):

   The slope of the line in part (c) is the opposite of the slope of the line in part (b). The $y$-intercepts are the same.

3. Where would the line $y=−2x+1$ lie? Again, justify your prediction and add the graph of this line to your graph.