If the positive proportional function y = 3x is parallel to the image of the linear function y = (K-3) x + √ 2, try to find the value of K and explain the reason

If the positive proportional function y = 3x is parallel to the image of the linear function y = (K-3) x + √ 2, try to find the value of K and explain the reason

The two lines are parallel and the slopes are equal
So 3 = K-3
k=6