Identify question prompt: The question prompt is asking for the slope of a line that has a constant y-value of 25 and an undefined y-intercept.
Horizontal line characteristics: A line with a constant y-value, such as y=25, is a horizontal line. The slope of a horizontal line is 0 because there is no change in the y-value as the x-value changes.
Calculate slope using formula: The slope m of a line is calculated using the formula m=(change in y)/(change in x). For a horizontal line, the change in y is 0, so the slope m=0/(change in x)=0.
Y-intercept is undefined: Since the line is horizontal and has a constant y-value, it does not cross the y-axis at any point; therefore, the y-intercept is undefined. This is consistent with the information given in the problem.
More problems from Write equations of cosine functions using properties