Question

HELP...write the equation for the horizontal line passing throught (4,6)
y=4
y=-6
y=4/6
y=-6/4

Answer 1

Here's a graph that shows point (4, 6) and the horizontal line that passes through it.

Answer 2

Now let's look at other points of the line.
Notice that every point has a y-coordinate of 6.
No matter what the x-coordinate of a point on the line is, the y-coordinate is always 6.
That suggests y = 6.