Find the general (explicit) solution to the differential equation: dy dx = y4 cos x

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

The ratio pv to nrt is plotted against pressure for ch4 at 0°c and 200°c. why does the curve for 0°c drop below the horizontal line for an ideal gas whereas the curve for 200°c does not?

Which inequality has a dashed boundary line when graphed ?