Me with this super short math problem, im really stuck and i need . you : d

Let's say that the cost of a ticket in japan is $x and the cost of a ticket in switzerland is $y:

(1) 3x + 2y = 81.51
if we multiply both sides of the equation by 2 we get: 6x + 4y = 163.02
(2) 3y + 2x = 77.39
if we multiply both sides of the equation by 3 we get: 9y + 6x = 232.17

now let's subtract equation (1) from equation (2):
9y + 6x - (6x + 4y) = 232.17 - 163.02
5y = 69.15
y = 13.83

substituting this into (the original) equation (1) we get:
3x + 2(13.83) = 81.51
3x + 27.66 = 81.51
3x = 53.85
x = 17.95

thus the average cost of a ticket in japan is $17.95 and then average cost of a ticket in switzerland is $13.83

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.