Question 72380
To find if they are perpendicular you need to put them in slope-intercept form and find the slope of each;
4y=x+5
y={{{1/4}}}x+{{{5/4}}}
slope = {{{1/4}}}
9y+3x=2
9y=-3x+2
y={{{-3/9}}}x+{{{2/9}}}
slope = {{{-3/9}}}={{{-1/3}}}
For two lines to be perpendicular, the condition is that the slopes are negative reciprocals.
So these are not perpendicular
:)