Hi! I wrote the wrong equation for my last question. The correct problem is write an equation for the given?

point and slope: (-2,4) m= - 1/2 I know the answer is Y= -1/2X + 3 abd rearranging to get 2Y= 6-X I want to know how do you get the 2Y = 6-X from Y = -1/2X + 3? Thank you for your help!