Model and Solve Variables on Both Sides

Write the equation for the model.

• 2x - 2 = -x - 8

• -x - 2x = 2x - 8x

• -x - 2 = 2x - 8

• -x - 4 = 2x + 2

• -x - 2 = 2x - 4

• -x + 2 = 2x - 4

Write the equation for the model.

• -x + 2 = 2x - 1

• -x + 2x = 2x - x

• 2x + 2 = -x - 1

• x = 4
• x = -4
• x = 36
• x = -36

Mathematical Equivalence

ON

Mathematical Equivalence

ON

Solve the equation for the variable

• 6

• -6

• -1

• 3

The square and equilateral triangle below have the same perimeter. Find the value of x. Then, find the perimeter of each shape. Equation:​ (a)   X = ​ (b)   Perimeter: ​ (c)  

• 2

• 36

• 5

• 42

Solve the equation for the variable

• 4

• -10

• 1

• -1