2006-08-24 11:07:50 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
For a line perpendicular to the given line, swap the two coefficients (1 and 2) and make one of them negative:
2x - y = ...
you only need to find the number on the dots. Simply substitute the known point:
2*(-3) - (-1) = -6 + 1 = -5
so 2x - y = -5 is a solution.
2006-08-24 11:14:19 · answer #1 · answered by dutch_prof 4 · 0⤊ 0⤋
rewrite x+2y=5 as y=(-1/2)x + (5/2)
perpendiculars to this line must be of the y=2x + b form.
now check the point (-3,-1)
-1 = -6 + b --> b = 5
and the answer is y = 2x + 5
2006-08-24 18:45:47 · answer #2 · answered by will_rj 2 · 0⤊ 0⤋
First put this equation in standard y=mx + b form.
Then use the fact that given a line with slope m, a line perpendicular to it has slope -1/m. Then use the formula for a line given a point and the slope. You do the details.
2006-08-24 18:13:41 · answer #3 · answered by banjuja58 4 · 0⤊ 0⤋
x + 2y = 5
2y = -x + 5
y = (-1/2)x + (5/2)
(-3,-1), m = 2
-1 = 2(-3) + b
-1 = -6 + b
b = 5
ANS : y = 2x + 5
2006-08-24 20:16:02 · answer #4 · answered by Sherman81 6 · 0⤊ 0⤋
Is this your homework?
2006-08-24 18:12:54 · answer #5 · answered by Anonymous · 0⤊ 0⤋