To find the net yardage for the four plays, we need to combine the gains and losses of yardage.
- Gain 25x yards: \( +25x \)
- Gain 0.9y yards: \( +0.9y \)
- Lose 12y yards: \( -12y \)
- Lose 5.2x yards: \( -5.2x \)
Now, let's combine the gains and the losses for each variable:
For the variable \( x \): \( +25x - 5.2x = (25 - 5.2)x = 19.8x \)
For the variable \( y \): \( +0.9y - 12y = (0.9 - 12)y = -11.1y \)
Now we can express the net yardage as follows:
Net yardage = \( 19.8x - 11.1y \)
Thus, the final answer is:
\[ 19.8x - 11.1y \]