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Report Abuse. the point where the graph crosses the y-axis is the y-intercept, and the x-coordinate of this is 0 since it is crossing the y-axis (any point on the y-axis has an x-coordinate of 0). bialy Â· 7 years ago. Thumbs up.
That is what makes them reflections about the y-axis. 4) Reflections about the line y = x is accomplished by interchanging the x and the y-values. Thus for y = f(x) the reflection about the line y = x is accomplished by x = f(y). Thus the reflection about the line y = x for y = x2 is the equation x = y2. These are graphed on the following graph: The blue line is where you would fold the paper for these two graphs to match. Notice that the green parabola is opening up but when you fold it across the blue line, it opens to the right.