How do you find the slope for y=18?

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Answer 1 · 2016-09-19T14:47:54

$0$

$y=18$ 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 $(x,y)->(0,18)$

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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