0.
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-9
-9
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.
y equals 3x has the greater slope.
12.2