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To solve this equation we need to make it so the x's or the y's of each equation are equal. To do this we need to multiply one or both equations so we can take or add one of the equations to the other. We...

This is because the QRS complex on the ECG (which represents the Ventricular depolarisation) is at such a high magnitude, it masks the electrical signals that occur due to atrial repolarisation as these t...