5y=2x y=2/5x 10y=4x 5xy=2 which equation does not belong with the other three ? ?

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?

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9