Up Your Score SAT, 2018-2019 Edition The Underground Guide to Outsmarting The Test

*Why    “m”?    The world   may never   know.

—Samantha

Another helpful way to think of slope is “rise over run,” where rise means up
or down and run means across. Going from left to right (or from point B to point
A), we went up 7 and across 3. To continue this line segment, we would go up
another 7 and across another 3.
Lines that are parallel have the same slope, but different y-intercepts. This
allows the SAT to write horrifying problems like this:

Line    p   and line    r   are parallel.   What    is  the y-intercept of  line    r?

You can determine   y-intercepts    by  setting x   equal   to  0,  while   x-intercepts    are found   by  setting y   equal   to  0.

—Samantha

With only one coordinate in line r, there isn’t a lot we can say about it.
Luckily, it is parallel to line p, which has two coordinates, and can thus be
converted to y = mx + b form. b is given to us, 3, because it hits the y-axis at y-
coordinate 3.

y   =   mx  +   3

To  find    m,  use the slope   formula:    

If  line    r   has the same    slope,  then    its formula is: