A part of the graph representing an electrical signal is shown. The voltage first rises steadily from an initial value (A) till a maximum value (B) and then drops instantly till to the initial voltage (at C) and this repeats, such that || and and are vertical. If A = (1, 1) and B = (4, 3) respectively, then what is the equation of ?
From A to B, the equation can be thought of as a line. Given two points, the equation of the line can be determined. First, the slope of the line must be known. Calculating, the slope is 2/3.
The equation is then 2x -3y =2(1) -3(1),
2x -3y=-1
