Answer:
[tex]12x + 9y \geq = 510\\ y\leq 2x\\ y \geq 25[/tex]
Step-by-step explanation:
If x represents the number of lawns and 'y' represents the number of dogs that Fabio walked then:
The amount of money raised by Fabio plus the amount of money raised by Gwen must be greater than or equal to $ 510.
[tex]12x + 9y \geq = 510[/tex]
The number of dogs that Fabio will walk is less than or equal to twice the number of yards of lawn cleared by Gwen.
[tex]y\leq 2x[/tex]
Fabio will walk at least 25 dogs
[tex]y \geq 25[/tex]
Finally, the restrictions are:
[tex]12x + 9y \geq = 510\\ y\leq 2x\\ y \geq 25[/tex]