I never learned a rule for reflection, but the easiest method would be to count the number of points the point of your figure/line from the x- axis or y-axis, and apply the same number onto the other side. That's how I always did it. It you were to just move the whole figure over, that would only be translation! make sure the figure/line makes sense of where it is.
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When they are scalar, xy and yx are equivalent. When they are vectors or matrices, they are not equivalent.
If y = 0 then yx - 5 = 0*x - 5 = 0 - 5 = -5
Example: if you have a point with the coordinates (2,4), a reflection over the y-axis will result in the point with coordinates (-2,4).
You can graph an equation or an inequality but you cannot graph an expression.
xy = x ÷x y = 1