Bobby wants to go on a school trip that will cost him $250. He comes up with an equation that represents how much he needs to sa
ve each week as follows: 25w+30=250, where W is the number of week spent saving. If he has 9 weeks to save will you have enough money to go on the trip? Explain.
Yes, Bobby will have enough money if he saves for 9 weeks. You can find this through either substituting w for 9 in the equation, or solving the equation itself.
Substituting:
Substitute w for 9.
Simplify.
Solve.
255 is greater than 250, so yes, he will have enough money saved.
Solving the equation:
Original Equation
Subtract 30 from both sides.
Divide both sides by 25.
The number of weeks he needs is 8.8. When rounding it up, you get 9.