So first, this is point slope form. The first step is to distribute.)

Then add 4 to both sides.

Then add 2x and it becomes
The equation in slope intercept form is 
Explanation:
The given pair of points are
and 
The slope can be determined using the formula,

Substituting the points
and
in the slope formula, we have,



The equation in slope intercept form can be determined using the formula,

Substituting
and the point
in the above formula, we get,




Thus, the equation in slope intercept form is 
Let jae have x dollars. Thus, we can make the equation:-
x + 3x + 2*(3x) = 400
4x + 6x = 400
10x = 400
x = 40
So jae has $40 and
jaspar has 3x = 3* 40
= $120 dollars (answer