You want to find the equation for a line that passes through the point (1,4) and has a slope of 3. First of all, remember what the equation of a line is:
y = mx+b Where: m is the slope, and b is the y-intercept To start, you know what m is; it's just the slope, which you said was 3. So you can right away fill in the equation for a line somewhat to read: y=3x+b. Now, what about b, the y-intercept?
To find b, think about what your (x,y) point means: (1,4). When x of the line is 1, y of the line must be 4.
