Question 444828
slope of second line
(7-1)/(2-0)
slope of first line
(5-2)/(x-12)
we want the two slopes multiplied to equal -1
(7-1)/(2-0)*(5-2)/(x-12)=-1
it looks harder than it is.
just do the math.
6/2*3/(x-12)=-1
9/x-12=-1
9=-1*(x-12)
-9=x-12
add 12
3=x