Rewrite in Standard Form y-9=-1/2*(x-10). y−9=−12⋅(x−10) y - 9 = - 1 2 ⋅ ( x - 10 ). To write a linear equation in standard form, move each variable term to the left side of the equation and simplify. Ax+By=C A x + B y = C. Move all terms containing variables to the left side of the equation.