equations

Solve the formula for b.  What is the 1st step? 

• Subtract h from each side. 
• Add h to each side. 
• Divide each side by h. 
• Multiply each side by 2. 

Solve the equation for w.  
^{x = w / a}

• w = a / x
• w = x / a
• w = ax
• x = wa

M= i + r

solve for r

• r = M - i

• r = M + i

• i = -M - r

• r = -M + i

Solve for x:

• x = yb - v

• x = by - v

• x = by + v

• x = y + b + v

Solve:
C = 2πr, for r

• C/(2π) = r
• C + 2π = r
• C - 2π = r
• 2πC = r

3r - 24= -r

• r = 6

• r = 12

• r = -8

• r = -12

9 + 2a = -3 - 4a

• a = -2

• a = 2

• a = 5

• a = -1

Solve:

7x = 3x + 24

• 6

• 10

• 14

• 4

CREATE AND SOLVE:

Joe’s Canoes charges an initial fee of $20 plus $4 an hour. Callie’s Canoes charges a flat rate of $14 an hour. Find the number of hours for which the total amount that both places charge would be the same.

• 3 hours

• 4 hours

• 1 hour

• 2 hours