There's only one answer. Which one is it?

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Answer 1 · 2018-06-25T16:06:48

The second selection is correct.

Here is how you figure it out.

For the first and second selections, we must let $x = 0$ :

$p(0) + qy = s$

$y = s/q$

The first selection is incorrect but the second selection is correct.

For the third and fourth selections, we must let $y = 0$

$px + q(0) = s$

$x = s/p$

This shows that the third and fourth selections are incorrect.