When two lines are parallel it means that they have the same slope:
First we need to know that the general formula for a lineal equation is:
So, we have the ecuation x - 2y = 42 we can put it in the general way by clearing the y as follow:
So, if we organice that:
So the scope in this equation is: m=1/2. It means that the equation parallel to it have also slope m=1/2
Now, we can use the point (2,2) to find the value of the b in the lineal equation formula, as follow:
x=2
y=2
Knowing that, the equation is: