Change $y= (1/2)x +1$ into standard form and get the answer $x-2y=-2$ I know the answer to the problem because I can check the answers in the back of the book but when I do the work myself I get 
$$
-\frac{1}{2}x +y= 1
$$
when I attempt to change it into standard. I need a step by step explanation on how the book got 
$$
x-2y=-2.
$$

For standard form your x-coefficient needs to be positive and all coefficients must be integers, so multiply the entire expression by -2
