--------------------------------------------------
a) With a slope of 0 and a y-intercept of 10.
--------------------------------------------------
Flat, horizontal, so y is 10 everywhere.
-----------------------------------------------------
b) With an undefined slope and an x-intercept of -3.
-----------------------------------------------------
No slope, and line is vertical, taking all real values for y.
---------------------------------------------------------
c) With a positive slope and a negative y-intercept.
---------------------------------------------------------
You choose.
Use any and .