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Presumably because the lines are plotted on the Cartesian plane. So the line intersects the y-axis at the point (0, y).

The standart form of the equation of a line is y = ax + bx + c. If you replace x with 0, then y = c. Thus, the y-intercept point is (0, c).

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Q: Why is c used for the y intercept in maths?
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