(a) Put the expression $3 x k + 4 k + 3 - 12 x$ into the form $b + m x$.

$+ \Big($ $\Big) x$.

(b) Is the expression $3 xy + 4 x + 3 - 12 y$ linear in the variable $x$? If it is linear, enter the slope. If it is not linear, enter NO.

help (formulas)