The answer is (4, 4)
Reason: in the formula y = 1/4x +3
The 1/4 is the slope
The 3 is the y intercept
We start on the y intercept (3) and use the slope to count 1 up and 4 to the right.
For the formula x = 4 just plot the point on number 4 on the x line
The intercept is the point that the two formulas have in common.
I also graphed it to give you a visual of it
Hope this helps