Solving for Angles with a Variable

Write the equation that we use to solve for x:

• x + 12 + 55 = 180
• x + 12 + 55 = 90
• x +12 = 55
• x + 12 = 90

Write the equation that we use to solve for x:

• 7x = x + 20
• 7x + x + 20 = 180
• 7x + x + 20 = 90
• 7x = 180

Write an equation we can use to solve for x:

• 5x = 65
• 5x + 65 = 90
• 5x + 65 = 180
• 5x = 90

Write the equation we use to solve for x:

• 5x - 10 + 60 = 180
• 5x - 10 + 60 = 90
• 5x - 10 = 60
• 5x - 10 - 120

Write the equation we use to solve for x:

• 7x + 110 = 180
• 7x + 110 = 90
• 7x = 110
• 7x = 90

What equation should we use to solve for x?

• (x - 7) + 43 = 180
• (x - 7) + 43 = 90
• (x - 7) = 43 
• x - 7 = 90

Write the equation we use to solve for x

• 11x - 1 = 90
• (11x - 1) + 36 = 90
• (11x - 1) + 36 = 180
• (11x - 1) = 36 

Write the equation that we use to solve for x

• (x + 3) + 49 = 90
• (x + 3) = 49 
• (x + 3) + 49 = 180
• (x + 3)  = 90

What equation would we write to solve for y?

• 6y = 120
• 6y + 120 = 90
  y = 120
• 6y + 120 = 180
  y = 60
• 6y = 180
  y = 10

Write the equation we use to solve for x:

• 48 + 5x - 17 = 90
• 48 + 5x - 17 = 180
• 90 = 5x - 17
• 48 = 5x - 17