The slope-point formula:
[tex]y-y_1=m(x-x_1)[/tex]
We have (0, 2) and m = 0.
Substitute:
[tex]y-2=0(x-0)\\\\y-2=0\qquad|+2\\\\y=2[/tex]
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If a line has a slope of 0, then it's a horizontal line y = a.
