Answer:
The answer is 120 sq. ft.
Answers: 
1. Switch sides

2. Subtract by 8 from both sides of equation.

3. Simplify.

4. Multiply by -1 from both sides of equation. (it's should be the reverse inequality).

5. Simplify.

6. Then you had to divide by 9 from both sides of equation.

7. Simplify.

8. Divide by the numbers.



9. Divide by the numbers.



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Start at 4 and since it a negative go down one and over one
M=-1/2 because you do y1-y2 over x1-x2 and end up with 2/-4 but simplified is -1/2