9) which equation represents the line that passes through the point (3,4) and is parallel to the x-axis?

a x = 4
b x = 3
c y = 4
d y = 3

Since the line is parallell to the x-axis we know the slope is zero:

Using the point-slope formula we can substitute know values:






You could also jsut do it by inspection: since it passes through (3,4) and is horizontal it must cross at (0,4) i.e. all y=4.

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