Question

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

Answer 1

Move all terms that don't contain x to the right side, and solve. 
 x = - 3y/2 + 18

Answer 2

2x+(3)(6)=36

Simplify both sides of the equation.

2x+18=36

Subtract 18 from both sides.

2x+18−18=36−18

2x=18

Divide both sides by 2.

2x/2=18/2

x=9