The inequality representing the maximum number of gigabytes
Yusuf can use while staying within his budget is
. Since
must be a whole number, Yusuf can use at most 3 gigabytes to stay within his budget.
Let
be the number of gigabytes Yusuf uses. The total cost
is given by the flat cost plus the cost per gigabyte:
![\[ C = 57 + 5g \]](https://img.qammunity.org/2023/formulas/mathematics/high-school/5c15sx0vuh48nrl6ao7vmp2k5jk0ud3odg.png)
Yusuf wants to keep his bill under $75, so the inequality for his budget constraint is:
![\[ C \leq 75 \]](https://img.qammunity.org/2023/formulas/mathematics/high-school/rsoagwhuzicpd1gzl037nh8mfxfcl9juws.png)
Substitute the expression for
:
![\[ 57 + 5g \leq 75 \]](https://img.qammunity.org/2023/formulas/mathematics/high-school/jf8azo7k0y3fbah8buv1q0bgggcbqy2nlc.png)
Now, you can solve for
to find the maximum number of gigabytes Yusuf can use while staying within his budget. Subtract 57 from both sides:
![\[ 5g \leq 18 \]](https://img.qammunity.org/2023/formulas/mathematics/high-school/476xbz2vjpbfabyx2z0ck68qm9gxxo377i.png)
Divide both sides by 5:
![\[ g \leq 3.6 \]](https://img.qammunity.org/2023/formulas/mathematics/high-school/aj55jyf3e9yo2d6xg2r8ieojvr44pq20ca.png)
So, the inequality representing the maximum number of gigabytes
Yusuf can use while staying within his budget is
. Since
must be a whole number, Yusuf can use at most 3 gigabytes to stay within his budget.