The CRT display becomes an electronic graph of two instantaneous voltages. The display may be a direct comparision of two voltages such as during phase measurement, or frequency measurement with Lissajous waveforms.
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x and y are being combined using a binary operation called "plus" and the result is xy.
The answer depends on whether xy are commutative numbers or operators in a permutation group.
The horizontal sweep of an oscilloscope is in time per division or seconds per division.
xy+xy'
x+xy=8 xy=-x+8 y=-1+8/x