Ellie is saving to buy a phone. She wants to have at least $299 saved before buying one. She currently has $213 saved, and she receives $10 a week as an allowance from her parents. After how many weeks will Ellie have enough money saved? Ellie writes the inequality 10w+213≥299 , where w is the number of weeks, to help figure this out. Solve her inequality.
To solve the inequality 10w + 213 ≥ 299, we need to isolate the variable w.
Subtract 213 from both sides of the inequality:
10w + 213 - 213 ≥ 299 - 213
10w ≥ 86
Divide both sides of the inequality by 10:
10w/10 ≥ 86/10
w ≥ 8.6
Ellie will have enough money saved after 8 or more weeks.