Question

What is the value of X in the equation 2x+3y=36 when y=6

Answer 1

$2x+3y=36 \ and \ y=6 \\ \Downarrow \\ 2x+3 \times 6=36 \\ 2x+18=36 \\ 2x=36-18 \\ 2x=18 \\ x=\frac{18}{2} \\ \boxed{x=9}$