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Directly Related

Two things are directly related when they always move in the same direction.

When one goes up, the other goes up too. When one goes down, so does the other.

Together
Both numbers climb
Pump more gas

More gas pumped means more money spent. Both values move in the same direction.

The slider still controls the gas pump. Watch how the dot moves on the graph.

Pump more gas

When two things are directly related, the graph slopes up from left to right. Both axes climb together.

These terms will come up later in detail. For now, just notice: they follow the same pattern you just learned. Click to get a preview.

Intensity ▸
Definition: How strong or powerful the sound wave is.
Example: Think of it like volume—louder sound has more intensity.
Amplitude ▸
Definition: How tall the wave is, from peak to center.
Example: A bigger wave on the screen means a stronger signal. When intensity goes up, amplitude goes up too.

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