You can put this solution on YOUR website!
Hint: Parallel lines have equal slopes. So because slope of given line is 3, this means that m=3 for the unknown parallel line.
Also, the line needs to pass through (10,4). So when x=10, then y=4.
We have 3 pieces of info: m=3, x=10, and y=4. Plug all this into y=mx+b to get
4 = 3(10)+b
and now solve for b.
The answer will be y = 3x+b where 'b' is the answer you got above.