Solving for Variables in Formulas

Rewrite this formula and solve for the variable r. C = 2πr

• r = 2π / C

• r = C - 2 - π

• r = C - 2π

• r = C / 2π

Rewrite this formula and solve for the variable W. P = 2L + 2W

• W = P/2 - 2L

• W = P - 2L

• W = (2L - P) / 2

• W = (P - 2L) / 2

• (2.5+h)f
• g=1
• f(5+h)/2
• (5f+h) / 2

• b = 3A - a - c
• b = -3A + a - c
• b = -3A - a - c 
• b = 2A - c

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

• Divide each side by t. 

• Subtract t from each side. 

• Add t to each side. 

• Multiply each side by t. 

Tags

TEKS.MATH.8.8A

-2x+20=-5y 

• 2x+5y=20

• 2x-5y=20

• 20=2x-5y 

• -2x+5y=-20

5x - y = 16

• -y = 5x + 16

• y = 5x + 16

• x = 5y - 16

• y = 5x - 16

Solve for y:
2x + 2y = 6

• y = - x + 3

• y = x + 3

• y = 2x +6

• y = - 2x + 6

-16x=2y-10

• 8x+y=5

• -16x-2y=10

• 16x+2y=-10

• 8x-y=-5

Find the solution to the system of equations: 4x - 3y = 5 and 2x + 7y = 1

• x = 2, y = -1

• x = -1, y = 2

• x = 5, y = 3

• x = 3, y = 4