95.5k views
0 votes
You are trying to use lesswater on laundry this month than you used on laundrylast month. The amount of water w (in gallons)you save after x loads of laundry is given byw(x) = 160 - 20x. How many loads of laundry didhis month if you saved 40 gallons of water?

1 Answer

2 votes

Given:


w\left(x\right)=160-20x

Where:

w (x) = amount of water you save

x = loads of laundry

Knowing that you saved 40 gallons, then w (x) = 40.

Let's substitute w(x) by 40 and find x.


40=160-20x

Subtracting 160 from both sides of the equation:


\begin{gathered} 40-160=160-20x-160 \\ -120=160-160-20x \\ -120=0-20x \\ -120=-20x \end{gathered}

Dividing both sides by -20:


\begin{gathered} (-120)/(-20)=(-20x)/(-20) \\ 6=x \\ x=6 \end{gathered}

Answer: 6 loads of laundry.

User Ginger Opariti
by
9.0k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories