Question 923707
an equation of the line perpendicular to {{{9x+4y=6}}} and containing the point ({{{1}}}, {{{-1}}}):

{{{4y=-9x+6}}} 

{{{y=-(9/4)x+6/4}}}

{{{y=-(9/4)x+3/2}}} 


*[invoke equation_parallel_or_perpendicular "perpendicular", "-9/4", "3/2", 1, -1]