Parall lines have same slopes
You must find the slope of the given equation
Put the equation in the form of y = mx + b, where m is the slope
y - 3x = 1
Add 3x to both sides
y - 3x + 3x = 1 + 3x
y = 1 + 3x
m = 3
Look for the equation which have coefficient of x = 3