The standard form of this equation is 6x - y = 3. Standard form is Ax + By = C, where A and B are the coefficients for x and y, and C is the number without a variable attached, or the constant. We just need to do a bit of algebra to get the equation in standard form.
6x = y + 3 Given
6x - y = 3 Subtract y from both sides
Hope this helps!