y = 9 is a horizontal line with slope 0. Slope = (y2 - y1)/(x2-x1), and y is constant so that numerator is always 0. The y-intercept is where the line crosses the y-axis when x=0. Since y is always 9 in this case, that is the y-intercept.
If the numerator is 0, the fraction equals 0, because there is no part of the whole.
Negative reciprocals. That is, if one line has slope m (m ≠0), then the perpendicular to it has slope -1/m. If m = 0, the slope of the perpendicular is not defined - the line is of the form x = k.
If the numerator is 0 AND the denominator is not 0, then the ratio is 0. And cosine of 0 is 1.
If the original slope is 0, then the opposite reciprocal of 0 is still 0. Oops! Reciprocal of 0 (n/0) is undefined! A vertical line has undefined slope, the horizontal line has slope of 0.
A horizontal line has a slope of 0. If you're using the slope formula, then when the numerator is equal to 0 then the slope is 0.
y = 9 is a horizontal line with slope 0. Slope = (y2 - y1)/(x2-x1), and y is constant so that numerator is always 0. The y-intercept is where the line crosses the y-axis when x=0. Since y is always 9 in this case, that is the y-intercept.
If the numerator is 0, the fraction equals 0.
If the numerator is 0, the fraction equals 0, because there is no part of the whole.
Negative reciprocals. That is, if one line has slope m (m ≠0), then the perpendicular to it has slope -1/m. If m = 0, the slope of the perpendicular is not defined - the line is of the form x = k.
If the numerator is 0 AND the denominator is not 0, then the ratio is 0. And cosine of 0 is 1.
If the original slope is 0, then the opposite reciprocal of 0 is still 0. Oops! Reciprocal of 0 (n/0) is undefined! A vertical line has undefined slope, the horizontal line has slope of 0.
if you define y = constant then the slope of any constant is 0 so if you define the line y = 0 the slope of 0 is 0.
If the numerator is 0 then, provided the denominator is not 0, the answer is always 0.
The slope is undefined.
A horizontal line parallel to x axis (slope = 0)
It is not possible to have nothing. If you don't have anything in numerator, it will be 0 (zero) by default. And when there is 0 in numerator, it doesn't matters what number is in denominator because the answer will be 0 only. So if there is nothing in the numerator but something is in the denominator, the answer will be 0.