21. write the equation of the line that is
perpendicular to y = -x - 11 and passes through
the point (9,2).

When a line is given in the form

The slope of the line is m. So, in this case, the slope of is -1.

Given a slope , you find the slope of a perpendicular line by imposing

So, if the given line has slope -1, a perpendicular line has slope given by

and thus

So, we want a line with slope 1 and passing through (9,2). Using the fomula

we get

you would need to know all the numbers that are on there

step-by-step explanation:

it has changed from the width and the height.

step-by-step explanation: