Where does the graph of the linear equation, y = x - 3, cross the y-axis?

Question

what is the answer

 

Answer 1

The y-axis is the line at which x = 0.  So substitute 0 for x in the equation:

 

y = 0 - 3 = -3.

 

So when x = 0, y = -3.  So the graph crosses the y-axis at the point (0, -3).