So we need to start by using point slope form.
The general forumla of point slope is:
![Y-Y_1=m(X-X_1)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/2u0wymq5gwuy5ysy4vucqaq86rm3nqxhh6.png)
Y₁ Is the Y Coordinate, X₁ is the X Coordinate, and M is the slope. So we plug these numbers into our formula.
![Y--7 = 3(X--4)\\Y+7=3(X+4)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/xbfkyjwqpao6vgre62fscsys5h5neu3l5d.png)
Now, In order to solve in slope-intercept form, we have to isloate the Y and make sure it follows Y = mx+b so.
![Y+7 = 3(x+4)\\Y+7 = 3x+12\\Y=3x+5](https://img.qammunity.org/2019/formulas/mathematics/middle-school/ll3y204iokxwwdztv9eb3g0hhns5sh8e21.png)
So the equation is Y = 3x+5