<p>2x-5y=8
4x+ky=17</p>
<p>For which of the following values of k will the system of equations above have NO solution?</p>
<p>(A) -10
(B) -5
(C) 0
(D) 5
(E) 10</p>
<p>I'd appreciate some help with this one!</p>
<p>-10
$x is twice 2x, so k must be double of -5. In that case, then 2x-5y would be both 8 and 8.5, which gives no solution</p>