David W. answered 02/16/19
Experienced Prof
You may take the time to convert the Standard Format of a line (Ax+By=C) to slope-intercept form\, but remember that the slope,m, is (-A/B). The parallel line has the same slope (but a different C).
The slope of all parallel lines is the negative reciprocal, that is (-1/m) or B/A.
Line x + 6y = 14 has parallel line with point (-3,4).
-3 + 6(4) = C
21 = C
The parallel line is: x + 6y = 21
The perpendicular line is 6x - y = C
6(-3) - 4 = C
-22 = C
The perpendicular line is 6x - y = -22