Answer:
The answer is 12 hours
x * x = x^2
x * .7 = .7x
-6 * x = -6x
-6 * .7 = -4.2
x^2 + .7x - 6x -4.2
x^2 - 5.3 - 4.2
x = 6
y=
Step-by-step explanation:
2x+3y=C
isolate y
3y=C-2x