7th grade math pls help

2y= 3 2 x−2 y = − 1 3 x + 1 y=− 3 1 x+1

A50% increase followed by 33 1/2% decrease

The average daily maximum temperature for laura’s hometown can be modeled by the function f(x)=4.5sin(πx/6)+11.8 , where f(x) is the temperature in °c and x is the month. x = 0 corresponds to january.what is the average daily maximum temperature in may? round to the nearest tenth of a degree if needed.use 3.14 for π .