Set up the earnings equation for the volleyball team where w is the number of cars washed:

E = Price per cars washed * w + past fundraisers

E = 4w + 81

Set up the earnings equation for the wrestling team where w is the number of cars washed:

E = Price per cars washed * w + past fundraisers

E = 2w + 85

If the raised the same amount in total, set both earnings equations equal to each other:

4w + 81 = 2w + 85

Solve for

*w*in the equation 4w + 81 = 2w + 85

**Step 1: Group variables:**

We need to group our variables 4w and 2w. To do that, we subtract 2w from both sides

4w + 81 - 2w = 2w + 85 - 2w

**Step 2: Cancel 2w on the right side:**

2w + 81 = 85

**Step 3: Group constants:**

We need to group our constants 81 and 85. To do that, we subtract 81 from both sides

2w + 81 - 81 = 85 - 81

**Step 4: Cancel 81 on the left side:**

2w = 4

**Step 5: Divide each side of the equation by 2**

2w/2 = 4/2

w =

**2 <-- How many cars it will take**

To get the total earnings, we take either the volleyball or wrestling team's Earnings equation and plug in w = 2:

E = 4(2) + 81

E = 8 + 81

E =

**89 <-- Total Earnings**