Write the equation of a line through the given point and per
Write the equation of a line through the given point, and perpendicular to the given line. Write the final answer in slope intercept form.
1. (-4,-3) ; y=2/5x-2
2. (2,6) ; y +3 = -3/7 (x-2)
Solution
If you are given a line :y=mx+c. Then slope of a line perpendicular to it is: -1/m
1.
Slope of given line is: 2/5
Hence slope of line perpendicular to it is: -5/2
In slope intercept form equation is: y=-5/2x+c
Substituting the given point we get:
-3=(-4)*(-5/2)+c
This gives :c=-13
Hence equation is: y=-5/2x-13
2.
Slope of given line is: -3/7 hence slope of line perpendicular to given line is: 7/3
Equation in slope intercept form is: y=7/3x+c
Substituting given point gives:
6=(7/3)*2+c
Solving gives:c=4/3
Hence equation is: y=7/3x+4/3
