The line kx + 3y = 15 passes through the point (3, 2). What is the value of k?

If the line passes through $(3, 2)$, those coordinates must satisfy $kx + 3y = 15$. Substitute $x = 3$ and $y = 2$: $3k + 3(2) = 15$, so $3k + 6 = 15$, then $3k = 9$ and $k = 3$, choice A. Check: $3(3) + 3(2) = 9 + 6 = 15$. Choice B (5) comes from dividing 15 by 3 without using the point. Choice C (9) is the value of $3k$, not $k$, an unfinished last step. Choice D (1) does not work: $1(3) + 3(2) = 9$, not 15. Substitute the point, then isolate $k$.