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
