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Math·Algebra·Systems of two linear equations in two variables

hard

$5x+8y=9$

$15x+24y=27$

For each real number $r$, which of the following points lies on the graph of each equation in the $xy$-plane for the given system?

A

$(r,-\frac{5r}{8}+\frac{9}{8})$

B

$(-\frac{5r}{8}+\frac{9}{8},r)$

C

$(-\frac{5r}{8}+9,\frac{5r}{8}+27)$

D

$(\frac{r}{3}+9,-\frac{r}{3}+27)$