Simplifying 4x + -1y = 10 Solving 4x + -1y = 10 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. 4x + -1y + y = 10 + y Combine like terms: -1y + y = 0 4x + 0 = 10 + y 4x = 10 + y Divide each side by '4'. x = 2.5 + 0.25y Simplifying x = 2.5 + 0.25y