In transformations a reflection across the x axis produces a mirror image
The x-axis runs horizontally across the graph and the y-axis runs vertically on it.
Y axis going up; and X axis going across.
It is f(x) = -x^2.
X axis goes across (horizontal) Y axis is up and down (vertical)
In transformations a reflection across the x axis produces a mirror image
The x-axis runs horizontally across the graph and the y-axis runs vertically on it.
y = -f(x) is a reflection of y = f(x) in the x axis.
X axis is across and Y axis is down
On a graph the x axis is the one going across the screen, the horizontal axis, and the y axis is going up or down, the vertical axis. A very simple way of remember is to think that the letter x looks like a cross. The letter x is a cross, and the x axis goes across the screen.
For a reflection across the x axis, both the slope and the y intercept would have the same magnitude but the opposite sign.
Y axis going up; and X axis going across.
Reflection across the y-axis changes the sign of the x - coordinate only, that is, (x, y) becomes (-x, y).
Since the x coordinate will change, but not the y coordinate, take (x,y) and reflect across the y axis and you have (-x,y)
(x,y) --> (x,-y)
Easy way to remember which axis is which: x is a cross (across)
Easy way to remember which axis is which: x is a cross (across)