Question

How do you find the slope for y=18?

Answer 1

`0`

Explanation:

`y=18` allocates a constant value of 18 to y.

So no mater what value `x` is `y` will always be 18

The result is a straight line that is parallel to the x-axis and the line passes through the point on the y-axis `(x,y)->(0,18)`

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Mathematically:

The slope is `("change in y")/("change in x")`

Let any point `P_1->(x_1,y_1)=(x_1,18)`

Let another point `P_2->(x_2,y_2)->(x_2,18)` where `P_1!=P_2`

Then slope `->m->("change in y")/("change in x") = (y_2-y_1)/(x_2-x_1) = (18-18)/(x_2-x_1) =0`