2x + y ≤ 10
<span>y ≤ - 2x + 10 → you can see the line in red </span>
<span>As the sign is ≤, you keep only the part below the red line, included the red line </span>
<span>2x - 4y < 8 </span>
<span>- 4y < - 2x + 8 </span>
<span>y > (- 2x + 8)/- 4 </span>
<span>y > - (1/2)x - 2 → you can see the line in blue </span>
<span>As the sign is >, you keep only the part above the blue line
</span><span>A, C, D, K</span>
They are parallel to each other
By defferentiating the about using product rule
vdyu/dx +udvdx
dy/dx 4×^3 +6×^2-4× -4=o
