What is 2x+y=-2 in slope intercept form?

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Which expression gives the exact value of x?

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 .