Posted by ashley on Wednesday, February 17, 2010 at 10:38am.
write equation of line that passes through the point
1)parallel to the given line
2)perpendicular to the given line
pt (6,2)
line 9x+9y=144
a)para 9x+9y=72
perp 9x9y=36
b)para 9x9y=36
perp 9x9y=72
c)para 9x+9y=36
perp 9x9y=72
d)para 9x9y=72
perp 9x9y=72

calculus  Damon, Wednesday, February 17, 2010 at 10:53am
Write equations in the form
y = m x + b
then m is the slope
then put the coordinates in to get b
in this case
9 y = 9 x + 144
or
y = 1 x + 16
slope is 1 so parallel is
y = x + b
through (6,2)
2 = 6 + b
b = 4
so for parallel y = x  4
or
9 y = 9 x  36
9x  9y = 36
So I get none of the above for the parallel line. Typo?

calculus  ashley, Wednesday, February 17, 2010 at 11:07am
sorry I can't seem to type this morning
b) para 9x+9y=36
perp 9x9y=72

calculus  Damon, Wednesday, February 17, 2010 at 11:13am
ok for parallel
now perp
y = x +b
(6,2)
2 = 6+b
b = 8
so
y = 1x + 8
9y = 9x + 72
9x  9y = 72 yes
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