The answer to your question:
81/10, 8.1, and 8 1/10
Your answer is right
3x^2 + 13x + 4
X = 3 that is you x intercept
y = 2 that is your y intercept
X = (15 - 8y)/9
-5[(15 - 8y)/9] + 12y = -107
(-75/9) + (40/9) + 12y = -107
y = -8.59
x = [15 - 8(-8.59)]/9
x = 9.3
(x,y) = (9.3, -8.59)