a. $6$ b. $6$ is not a solution of the equation
Work Step by Step
$a.$ Replace x with 3 and y with 6: $6x-2y=$ $=6(3)-2(6)$ $=18-12$ $=6$ b. If the number $6$ is the solution to the equation, then replacing $w$ with $6$ should result in a valid equation (the left side should be equal to the right side of the equality sign) $7w=45-2w\quad?$ $7(6)=45-2(6)\quad?$ $42=45-12\quad?$ No, the equation is not valid, $6$ is not a solution of the equation.