Ty can send a maximum of 475 texts while affording the cell phone plan.
Let
be the number of texts Ty can send. The total cost of the cell phone plan is the sum of the fixed monthly cost and the cost per text:
![\[ \text{Total cost} = \text{Fixed cost} + \text{Cost per text} * \text{Number of texts} \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/nknhcolqw6lkarnsps5zgm631o572htyxj.png)
Ty's monthly income is $150, and she wants to make sure she can afford the plan, so we set up the inequality:
![\[ 150 \geq 55 + 0.20t \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/izeatr8v3ahzxb370v8m7fuv0w435rv0y6.png)
Step-by-step explanation:
- $150 is her monthly income.
- $55 is the fixed cost of the cell phone plan.
-
is the cost of sending
texts at $0.20 per text.
The inequality
ensures that Ty's income is greater than or equal to the total cost of the cell phone plan, including the cost of texts. This way, she can afford the plan and have some money left from her babysitting income.
To find the maximum number of texts Ty can send while affording the cell phone plan, solve the inequality for
:
![\[ 150 \geq 55 + 0.20t \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/izeatr8v3ahzxb370v8m7fuv0w435rv0y6.png)
Subtract 55 from both sides:
![\[ 95 \geq 0.20t \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/uqyo75y9j089lm0qxf4orgdsozd234qpk6.png)
Divide by 0.20:
![\[ t \leq (95)/(0.20) \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/tc67a9mon25qqvcr3up8tq5r2sresddrst.png)
Simplify:
![\[ t \leq 475 \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/f5wb8voaxsuinf18mlgii1si2raim4su6f.png)