Question 243295
Plug in the coordinates.


A(1, 2) --> a + 2b + 2c = 25.344
B(-2, 8.53) --> -2a - 17.06b + 8.53c = 25.344
C(0, 3.576) --> 3.576c = 25.344


c = 25.344/3.576 = 7.087


Now that you know c, you have a system of equations in a and b. You can solve this through substitution or elimination. I hope this helps.