Answer:
x = , y = 2
Step-by-step explanation:
3x + 3y - 7 = 12x + y
6y - 12x - 1 = -45x
(3x - 12x) + (3y - y) = 7
(-12x + 45x) + 6y = 1
-3(-9x + 2y = 7)
33x + 6y = 1
27x - 6y = -21
60x = -20 -> x = -20/60 = -1/3
-9x + 2y = 7 -> y = = = 2
this the answer.............. ...........
c. how late it is in the evening is a function of the length of time the shutter needs to stay open.
The second one. The -2y should have been +2y
a negative multiplied by a negative gives you a positive
