That's a horizontal line, with a slope of zero.
(You can't see it on the graph, because it lays right on top of the x-axis,
and you can't tell that it's there.)
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Slope and y-intercept of y equals 2.5x is: Slope is 2.5 and y-intercept is 0
Slope=3, y-intercept=0. y=3x or y=3x+0
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y = x + 0