I put in the functions in desmos, and here is what I got:
https://www.desmos.com/calculator/obzfylom2j
I split the trianlge into two, and calculated the summation of their areas.
(10 - 4)*2 + (10 - 4)*12 = 84
The area of the triangle is 84.
I hope this helped,
Gavin.
