Question 316752
Convert lines to slope-intercept form, {{{y=mx+b}}}.
A) 
{{{x-3y=4}}}
{{{-3y=-x+4}}}
{{{y=(1/3)x-4/3}}}
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.
.
{{{6x-2y=11}}}
{{{-2y=-6x+11}}}
{{{y=3x-11/2}}}
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.
.
Parallel lines have slopes that are identical.
Perpendicular lines have slope that are negative reciprocals. 
A) is neither of these. 
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.
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B)
{{{2x-4y=8}}}
{{{-4y=-2x+8}}}
{{{y=(1/2)x-2}}}
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.
.
{{{5x+y=9}}}
{{{y=-5x+9}}}
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.
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Again, comparing the slopes, {{{(1/2)}}} and {{{-5}}}, neither criteria apply.