0 votes 0 votes The points $(2,1)$ and $( – 3, – 4)$ are opposite vertices of a parallelogram. If the other two vertices lie on the line $x + 9y + c = 0,$ then $\text{c}$ is $12$ $14$ $13$ $15$ Quantitative Aptitude cat2020-set3 quantitative-aptitude geometry cartesian-coordinates + – soujanyareddy13 asked Sep 17, 2021 • retagged Mar 23, 2022 by Lakshman Bhaiya soujanyareddy13 2.7k points 324 views answer comment Share See all 0 reply Please log in or register to add a comment.