The graph D shows a line with slope zero.
Zero slope:
- Zero slope is perfectly flat as horizontal line.
- Since it is perfectly a horizontal line, it is also known as horizontal line.
- Here the x value and the y value both are independent.
- It is neither increasing nor decreasing.
- Formula used in zero slope/ horizontal line is given by y=c; where c is constant.
Since graph A, B and C doesn't make horizontal line, it is not a zero slope/ horizontal line.
Graph D is a horizontal line. It doesn't depend on any y value. It is neither increasing nor decreasing.
Therefore, graph D shows a line with a slope of zero.
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