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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

1. $12$
2. $14$
3. $13$
4. $15$

1
138 views
2
88 views
1 vote