the 3 one
Simplifying
2x + -1y = 20
Solving
2x + -1y = 20
Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'y' to each side of the equation.
2x + -1y + y = 20 + y
Combine like terms: -1y + y = 0 2x + 0 = 20 + y 2x = 20 + y Divide each side by '2'. x = 10 + 0.5y
Simplifying x = 10 + 0.5y