Hi
Find an equation of the line containing the point (6,9)
y = -9x + 8 | Yes same as 9x+y=8
"If" the new line is to be 'perpendicular' to the above..then Yes, its slope = 1/9
New Line:
y-9=1/9(x-6) | Yes.
y =1/9(x-6) + 9
y = 1/9(x) - 6/9 + 9
y= (1/9)x + 75/9 OR x-9y = -75