No. And for examples where they don't look at graphs where the x-axis is years.
If the scales do not start at zero, this fact should be clearly indicated.
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We set the denominator to zero to find the singularities: points where the graph is undefined.
A line on a graph with zero slope is a horizontalline.' Y ' is the same number at every point on the line.
A zero pair is an ordered pair of (0,0) located absolutely on the origin of a coordinate graph.
A graph intersects the y-axis at the y-intercept; its x value is zero.
The derivate of zero - as well as the derivative of ANY constant (non-variable) number, is zero. (A graph of y = 0 for example will be a horizontal line - the slope is zero.)