Question 182192
The question asks to create a graph of the followinf lines y=3/5x-4
y=-1/3x+2 and y=-5x-7 and indicate the points of intersection which i think i did because the next section says you should now have a triangle formed by the intersection of the three lines. Which i have graphed and it does make a triangle now it says to find the area of the triangle using two methods
Method 1 A=1/2 bh
Method 2 heron's formula
:
Hero's formula states (where a,b,c are lengths of the 3 sides)
s = {{{(a+b+c)/2}}}
then the area of a triangle is given by:
A = {{{sqrt(s(s-a)(s-b)(s-c))}}}
:
you have to know the lengths of the 3 sides which you can find using
the x/y coordinates of the three intersections and the 
the distance formula: d = {{{sqrt((x2-x1)^2 + (y2-y1)^2)}}}
;
does this help you?