122. write the equation of the line that is
perpendicular to y = x-5 and passes through
the point (12,-1).

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 (12,-1). Using the fomula

we get

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

option: d is correct

step-by-step explanation: