<p>This is a question from Math I subject test.</p>
<p>x+ky=1 and (1,2) is a point on the line</p>
<p>find k?</p>
<p>Choices = a) -2, b) -1, c) 1, d) 2, e) 3</p>
<p>Since (1,2) is a point on the line, it is a solution of the equation x + ky = 1. You plug in (1,2) for (x,y) in the equation and solve for k.</p>
<p>x + ky = 1
1 + k (2) = 1
Subtract 1 from both sides
2k = 0
Divide by 2
k = 0</p>
<p>lol this should be the right answer. maybe you copied it wrong or it’s a type-o.</p>
<p>Thank you very much for the complicated calculation</p>
<p>No i did not copy it wrong.</p>