then it's a permutation :
⁶P2 = 6!/(6-2)! = 30
There are 6 ways to chose the 1st letter, and 5 ways to choose the 2nd (because one letter already chosen), the there are 6x5 = 30 ways
side xy = 10
sin(x) = 4/5
cos(x) = 3/5
tan(x) = 4/3
i think something is missing in your question because y-1=(x-12) would not pass through the point (-4,-3). because if you replace x by -4 your are supposed to find y=-3 which is not the case her. if you replace x by -4 you find =-15.
i assume the right equation is y-1=1/4*(x-12) because this one is passing through both your points (if you are interested to know how i found that out i can tell you).
in this equation if i replace x by -4 i find y=-3 and if i replace x by 12, i find y=1 so the line representing this equation is passing through those 2 points.
then the standard form of the equation is finding an expression of y in function of x
hope that .
do you confirm there was a mistake in the question?