Consider the following, third, linear program $($LP$)$:

sc$3\_4.$jpg

Which of the following are equations for the iso$-$cost$/$iso$-$profit lines?

Group of answer choices

$0\mathrm{.}75*$x $$ y $=10$

$3*$x $+4*$y $=12$

$1\mathrm{.}33*$y $=$ x $-8$

$3*$x $4*$y

$6$

Exactly two answers are correct.

None of the answers are correct.